СПИСОК патентов США - подгруппа МПК16 H04M19/00
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| № п/п | Номер патента | Название патента | |||
2017 | |||||
| 1 | 9596362 | Automated determination of power transmission resistance | |||
| 2 | 9560218 | Reverse-powered transmission device | |||
2016 | |||||
| 3 | 9515507 | Energy-saving circuit for a network-powered device, network arrangement and energy-saving method | |||
| 4 | 9448576 | Programmable power supplies for cellular base stations and related methods of reducing power loss in cellular systems | |||
| 5 | 9432081 | Method and apparatus for providing electrical power to a broadband digital subscriber line access | |||
| 6 | 9380152 | Systems and methods for providing back power to a service unit | |||
| 7 | 9368976 | Adaptive inductive power supply with communication | |||
| 8 | 9362753 | Extended signaling system and method | |||
| 9 | 9325859 | Method for optimising electrical consumption of a residential gateway | |||
| 10 | 9319537 | Load balancing reverse power supply | |||
2015 | |||||
| 11 | 9203379 | Electronic inductance circuit for the power supply of a 2-wire bus intercom system and a device thereof | |||
| 12 | 8934946 | Mobile power supply device with expanding function | |||
2014 | |||||
| 13 | 8861554 | Systems and methods for powering a service unit | |||
| 14 | 8693679 | Communications system and associated method for reducing power consumption of a telecommunications device | |||
2007 | |||||
| 15 | 7256684 | Method and apparatus for remote powering of device connected to network | |||
| 16 | 7190785 | Subscriber line interface circuitry | |||
| 17 | 7184543 | Method and circuit arrangement for controlling a subscriber line interface circuit | |||
| 18 | 7181002 | Method and apparatus for a single power supply for dual power mode | |||
| 19 | 7180999 | Subscriber line interface circuitry | |||
| 20 | 7167557 | Subscriber line interface circuit (SLIC) including a transient output current limit circuit and related method | |||
| 21 | 7164763 | Power offloading for a subscriber line interface circuit | |||
| 22 | 7162650 | Network switching apparatus for supplying power to network communication equipment through twisted pair line | |||
2006 | |||||
| 23 | 7155008 | Power offloading for a subscriber line interface circuit | |||
| 24 | 7130415 | Line Driver apparatus | |||
| 25 | 7130414 | Active mode line voltage regulator for ringing subscriber line interface circuit | |||
| 26 | 7130412 | Telecommunication line driver having synthesized output impedance derived from output current sensing circuit | |||
| 27 | 7127061 | Line driver for digital signal transmission | |||
| 28 | 7116778 | Adaptive linefeed control for varying load on a subscriber loop | |||
| 29 | 7103178 | Speech amplifier-resident mechanism for controllably supplying power to a line circuit | |||
| 30 | 7099462 | Silent ringing with reduced device sizes | |||
| 31 | 7054439 | Differential input stage for electronic equipment, comprising means for reducing interference caused by a voltage or current in common mode | |||
| 32 | 7031463 | Resistive feed rail generation in a power supply | |||
| 33 | 6985578 | Low voltage broadband line driver | |||
2005 | |||||
| 34 | 6963762 | Mobile phone using tactile icons | |||
| 35 | 6963761 | System and method for sounding a music accompanied by light or vibration | |||
| 36 | 6961593 | Telescopic telephone | |||
| 37 | 6960713 | Portable telephone | |||
| 38 | 6959083 | Loop current monitor circuitry and method for a communication system | |||
| 39 | 6956945 | Method and apparatus for phantom battery feed | |||
| 40 | 6956160 | Tone generator apparatus sharing parameters among channels | |||
| 41 | 6954657 | Wireless communication device having intelligent alerting system | |||
| 42 | 6954531 | Software controlled ring voltage generator | |||
| 43 | 6947728 | Mobile phone with music reproduction function, music data reproduction method by mobile phone with music reproduction function, and the program thereof | |||
| 44 | 6947554 | Least mean power consumption in telecommunications systems | |||
| 45 | 6944482 | Visualization supplemented wireless mobile telephony | |||
| 46 | 6944286 | Ground key detection circuit and method for interference-resistant detection of the activation of a ground key for telephones | |||
| 47 | 6944285 | Communication terminal device, holds melody sensing method, incoming melody playing and information storing medium | |||
| 48 | 6940970 | Ring boost circuit to extend ringing range of telephone SLICs | |||
| 49 | 6937724 | Apparatus and method for delivery of ringing and voice calls through a workstation | |||
| 50 | 6934384 | Subscriber line interface circuitry | |||
| 51 | 6930671 | Method for dynamically lightening backlights of mobile communications terminal | |||
| 52 | 6928306 | Portable mobile unit | |||
| 53 | 6927336 | Interworking interface module for telecommunication switching systems | |||
| 54 | 6920209 | Computer-based method and apparatus for controlling, monitoring, recording and reporting telephone access | |||
| 55 | 6917681 | Peak power management and active decoupling arrangement for span-powered remote terminal access platforms | |||
| 56 | 6916212 | Comb and a method for making a branch connection to preexisting cabling | |||
| 57 | 6914980 | Power switch device utilizing phone loop signals to control supply of electrical power to a telephony instrument | |||
| 58 | 6909781 | DSL line tester | |||
| 59 | 6904013 | Error handling within power amplifier modules in wireless base-station | |||
| 60 | 6901139 | Calling party ringtone selection in telephone system | |||
| 61 | 6897787 | Method and apparatus for composing an illumination pattern | |||
| 62 | 6888938 | Dynamically adjustable digital gyrator having extendable feedback for stable DC load line | |||
| 63 | 6885745 | Voltage and protection arrangement for a telephone subscriber line interface circuit | |||
| 64 | 6882866 | Portable information apparatus and information notification method for the same | |||
| 65 | 6882713 | Telephone apparatus | |||
| 66 | 6881099 | Jack assembly | |||
| 67 | 6879848 | Method and apparatus for alerting an operator of an incoming cellular or portable phone call | |||
| 68 | 6879687 | Apparatus for sending a ringing signal and data with reduced impulse noise | |||
| 69 | 6876847 | Control of synchronous display of melody information and different information on mobile communication terminal | |||
| 70 | 6873702 | Telephone subscriber system | |||
| 71 | 6865271 | Constant current line circuit with class features | |||
| 72 | 6850782 | Wireless device with vibrational communication capabilities | |||
| 73 | 6847718 | Remote power feed method and system | |||
| 74 | 6847705 | Apparatus for receiving voice signal and data and controlling method thereof | |||
| 75 | 6840815 | Front access DSX assembly | |||
2004 | |||||
| 76 | 6830465 | Interconnect chassis and module | |||
| 77 | 6829354 | Biasing arrangement for optimizing DC feed characteristics for subscriber line interface circuit | |||
| 78 | 6829292 | Increasing gain with isolating upstream and downstream filters and amplifiers | |||
| 79 | 6823182 | Cellular mobile telephone apparatus | |||
| 80 | 6823066 | Digital access arrangement circuitry and method having current ramping control of the hookswitch | |||
| 81 | 6809641 | Method for disabling alarm temporarily in mobile communication terminal | |||
| 82 | 6807433 | Mobile communication terminal with unanswered incoming-call notifying function | |||
| 83 | 6807411 | Telecommunication equipment with at least one storage location reserved for operator-managed data and corresponding method | |||
| 84 | 6804347 | Replacing telecommunications carrier equipment | |||
| 85 | 6799998 | Jack assembly | |||
| 86 | 6799034 | Response message transmitter and response message transmitting method in cellular mobile telephone apparatus and recording medium recording program for executing the method | |||
| 87 | 6798879 | Remote telephone call notification system | |||
| 88 | 6792294 | Incoming notification pattern setting circuit and method of portable telephone | |||
| 89 | 6791276 | Gradually lighting/dimming wireless transmission indicator lamp | |||
| 90 | 6785563 | Mobile terminal operating in telephonic and tactile modes | |||
| 91 | 6778655 | Call waiting caller identifier | |||
| 92 | 6775531 | Subscriber terminal temperature regulation | |||
| 93 | 6775361 | Recording/playback apparatus with telephone and its control method, video camera with telephone and its control method, image communication apparatus, and storage medium | |||
| 94 | 6766004 | Method and apparatus for coordinating ringing and audio announcements in a phone system | |||
| 95 | 6764332 | Battery-driven equipment having a low-profile vibrator | |||
| 96 | 6763246 | Portable cordless telephone having an improved ringing device | |||
| 97 | 6763107 | Method and apparatus for reducing distortion in a line powered modulator circuit | |||
| 98 | 6763105 | Telephone with call-incoming-operation limiting function and method of limiting call-incoming operation of telephone | |||
| 99 | 6760583 | Portable mobile unit for conducting communication using one of character and picture information when a predetermined condition occurs | |||
| 100 | 6760434 | Dual impedance hybrid | |||
| 101 | 6760433 | Central office interface techniques for digital subscriber lines | |||
| 102 | 6760430 | System and method for reducing power dissipation in line driver circuits | |||
| 103 | 6757534 | Cellular phone with special standby feature | |||
| 104 | 6754363 | Structure of dual magnetic loop type receiver | |||
| 105 | 6754341 | External resistor and method to minimize power dissipation in DC holding circuitry for a communication system | |||
| 106 | 6751485 | Sounding alert for recent calls | |||
| 107 | 6744889 | Subscriber circuit for public telephone set | |||
| 108 | 6741702 | Device for connecting a subscriber line to a high frequency link and to a low frequency link | |||
| 109 | 6735305 | Detection of low tip/ring currents in a line powered DAA | |||
| 110 | 6735302 | DSP based SLIC architecture with current-sensing voltage synthesis impedance matching and DC feed control | |||
| 111 | 6731738 | Call tones in communication networks | |||
| 112 | 6731728 | Low noise line powered DAA with differential feedback | |||
| 113 | 6728371 | Method and apparatus for stabilization of a line powered modulator circuit | |||
| 114 | 6728362 | Continuity testing with call tone messaging in communication networks | |||
| 115 | 6728354 | Methods and devices for outputting audio announcements using CID related and other reference parameters | |||
| 116 | 6720864 | Wireless on-call communication system for management of on-call messaging and method therefor | |||
| 117 | 6718186 | Melody playing system | |||
| 118 | 6714123 | Electronic device incorporating vibration generator | |||
| 119 | 6711258 | Apparatus and method for controlling a volume in a digital telephone | |||
| 120 | 6711239 | System and method for identifying a callee of an incoming telephone call | |||
| 121 | 6707908 | Telephone terminal device | |||
| 122 | 6704582 | Personalized incoming call signal for communication devices | |||
| 123 | 6700975 | Subscriber line interface circuit | |||
| 124 | 6700974 | Switching power supply for generating a ringing voltage | |||
| 125 | 6697647 | Cellular mobile telephone apparatus and an alarm device therefor | |||
| 126 | 6697646 | Transceiver that prohibit the vibration motor | |||
| 127 | 6697470 | Incoming call indicator | |||
| 128 | 6694143 | System for using a local wireless network to control a device within range of the network | |||
| 129 | 6694014 | Constant impedance digital line interface circuit | |||
| 130 | 6687515 | Wireless video telephone with ambient light sensor | |||
| 131 | 6687371 | Maintaining an off-hook condition during a call bridge | |||
| 132 | 6681006 | Service activation upon automatic callback and automatic recall expiration | |||
| 133 | 6678377 | Monolithically integrated telephone circuit for driving wide-band telephone lines for data transmission | |||
| 134 | 6675026 | Method for editing terminating ring tone in a mobile wireless terminal | |||
| 135 | 6674857 | Startup procedure for international line powered DAA | |||
2003 | |||||
| 136 | 6671373 | Method and apparatus for DC feed control | |||
| 137 | 6671370 | Method and apparatus enabling a calling telephone handset to choose a ringing indication(s) to be played and/or shown at a receiving telephone handset | |||
| 138 | 6668060 | Tracking switchmode power converter for telephony interface circuit | |||
| 139 | 6665548 | Wireless communication device having display panel | |||
| 140 | 6665534 | Priority incoming call alerting system for a wireless communication system | |||
| 141 | 6665404 | Method and device for power supply in telecommunication systems | |||
| 142 | 6665403 | Digital gyrator | |||
| 143 | 6661894 | Circuit configuration and chip set for supplying a telephone subscriber loop with a supply voltage and network-side terminal of a telephone subscriber loop | |||
| 144 | 6661892 | Method and apparatus for decreasing distortion in a line powered modulator circuit | |||
| 145 | 6658270 | Displayer-embedded cellular phone battery | |||
| 146 | 6658109 | Method and apparatus for supplying power to a twisted pair wire on a telecommunications modem transmission link | |||
| 147 | 6658105 | Method to reduce distortion of a digital data signal by a pots ringing signal, and related telephone ringing signal generator | |||
| 148 | 6653930 | Urgency-based variable call notification | |||
| 149 | 6650746 | Urgency of call indication to called party through distinctive notification | |||
| 150 | 6650231 | Personal electronic device notification system | |||
| 151 | 6647117 | Continuity of voice carried over DSL during power failure | |||
| 152 | 6640318 | Continuity testing in communication networks | |||
| 153 | 6639984 | Feeder circuit | |||
| 154 | 6639983 | Adaptable line driver interface for digital telephone systems | |||
| 155 | 6636603 | System and method for determining the transmit power of a communication device operating on digital subscriber lines | |||
| 156 | 6636602 | Method for communicating | |||
| 157 | 6628971 | Method for displaying background image in mobile telephone | |||
| 158 | 6628194 | Filtered in-box for voice mail, e-mail, pages, web-based information, and faxes | |||
| 159 | 6624746 | Musical event information pager and paging system | |||
| 160 | 6621904 | Pre-charging line modem capacitors to reduce DC setup time | |||
| 161 | 6621903 | Portable telephone set and method for inputting said incoming call reporting melody | |||
| 162 | 6618482 | System and method for protecting devices connected to a telephone line | |||
| 163 | 6618470 | PORTABLE COMMUNICATION TERMINAL PROVIDING EXCITATIVE INDICATION SERVICE FOR INCOMING CALL REACHING IN ABSENCE OF USER'S ATTENTION, METHOD FOR PRODUCING EXCITATIVE INDICATION AND COMPUTER PROGRAM FOR THE METHOD | |||
| 164 | 6611592 | Incoming-call tone generation device | |||
| 165 | 6611583 | Computer-based method and apparatus for controlling, monitoring, recording and reporting telephone access | |||
| 166 | 6608996 | Cover for an electronic device | |||
| 167 | 6608900 | Load management system for an electrical device | |||
| 168 | 6606508 | Method for handling phone numbers in mobile station and mobile station | |||
| 169 | 6603985 | Ringing tone control method and device for mobile communication apparatus | |||
| 170 | 6590977 | Analog subscriber circuit | |||
| 171 | 6587682 | Signal routing for reduced power consumption in a conferencing system | |||
| 172 | 6587560 | Low voltage circuits powered by the phone line | |||
| 173 | 6587035 | Portable radio information terminal, message- notification method, recording medium and microcomputer | |||
| 174 | 6584306 | Two-way radio with silent annunciation | |||
| 175 | 6577730 | Modular digital telephone system and method including an universal telephony shelf | |||
| 176 | 6577729 | Alarm display and method | |||
| 177 | 6577722 | Call waiting response status | |||
| 178 | 6575792 | Jack assembly | |||
| 179 | 6573825 | Communication apparatus and alerting method | |||
| 180 | 6570983 | Method and system for audibly announcing an indication of an identity of a sender of a communication | |||
| 181 | 6570982 | Digital clocking synchronizing mechanism | |||
| 182 | 6570981 | Device and method for expanding legacy switches | |||
| 183 | 6567522 | Voltage alternating switch circuit | |||
| 184 | 6567521 | Subscriber loop interface circuitry having bifurcated common mode control | |||
| 185 | 6567518 | Method of field programmable gate array configuration | |||
| 186 | 6567517 | Timing and switching array and method | |||
| 187 | 6566957 | Methods and systems for a MOSFET-bipolar complimentary symmetry driver with local feedback for bias stabilization | |||
| 188 | 6563922 | Arbitration mechanism | |||
| 189 | 6563619 | Infrared data communication apparatus and method | |||
| 190 | 6560467 | Mobile phone provided with a device for notifying the user of the reception of a call signal and method therefor | |||
| 191 | 6560466 | Auditory feedback control through user detection | |||
| 192 | 6560323 | Computer-based method and apparatus for controlling, monitoring, recording and reporting telephone access | |||
| 193 | 6556665 | Portable telephone set | |||
| 194 | 6553118 | Method and apparatus for calculating DC offset in a digital gyrator | |||
| 195 | 6549790 | Portable telecommunication apparatus for multiple audio accessories | |||
| 196 | 6542605 | Method and arrangement for choosing supply voltage | |||
| 197 | 6539218 | Message transmitter and response message transmitting method in cellular mobile telephone apparatus and recording medium recording program for executing the method | |||
| 198 | 6532477 | Method and apparatus for generating an audio signature for a data item | |||
| 199 | 6525256 | Method of compressing a midi file | |||
| 200 | 6522745 | Digital access arrangement circuitry and method having a synthesized ringer impedance for connecting to phone lines | |||
| 201 | 6519326 | Telephone voice-ringing using a transmitted voice announcement | |||
| 202 | 6516024 | Digital access arrangement circuitry and method for connecting to phone lines having a DC holding circuit with low distortion and current limiting | |||
| 203 | 6510204 | Method and apparatus for providing an all digital loop with power-optimised mode | |||
| 204 | 6507654 | Line interface battery feed arrangements with PTC resistors | |||
| 205 | 6504864 | Digital access arrangement circuitry and method for connecting to phone lines having a second order DC holding circuit | |||
2002 | |||||
| 206 | 6501967 | Defining of a telephone's ringing tone | |||
| 207 | 6501019 | Isolation apparatus for electronic equipment | |||
| 208 | 6498966 | Method and system for distribution of stand-by electric power | |||
| 209 | 6498849 | Arrangement in a subscriber line interface circuit | |||
| 210 | 6498825 | Digital access arrangement circuitry and method for connecting to phone lines having a DC holding circuit with programmable current limiting | |||
| 211 | 6496358 | Breaker apparatus and breaker unit | |||
| 212 | 6489748 | Split backplane power system | |||
| 213 | 6486608 | Electroluminescent device for communication apparatus of mobile phone for informing an incoming call | |||
| 214 | 6480603 | Device which reduces central office battery current during modem connections | |||
| 215 | 6480602 | Ring-detect interface circuitry and method for a communication system | |||
| 216 | 6472591 | Portable communication terminal apparatus with music composition capability | |||
| 217 | 6470196 | Portable communication apparatus | |||
| 218 | 6469460 | Portable wireless terminal having separated vibration embodying circuit for alerting a user of an incoming call | |||
| 219 | 6463297 | Device and method for automatically disconnecting a call in a mobile radio communication terminal | |||
| 220 | 6456712 | Separation of ring detection functions across isolation barrier for minimum power | |||
| 221 | 6449359 | Telephone identification calling apparatus and procedures | |||
| 222 | 6449136 | Active current limiter | |||
| 223 | 6442271 | Digital isolation system with low power mode | |||
| 224 | 6442213 | Digital isolation system with hybrid circuit in ADC calibration loop | |||
| 225 | 6442017 | Battery-power distribution panel for network equipment | |||
| 226 | 6438392 | Absence reception information device and absence reception information method for folding portable cellular phone | |||
| 227 | 6434236 | PC server telecommunications power system | |||
| 228 | 6434225 | Communication support system in which a ringing sound control processing is performed in response to a call from a telephone network | |||
| 229 | 6427011 | Modem data access arrangement without diode bridge | |||
| 230 | 6424251 | Personal electronic device notification system | |||
| 231 | 6418330 | Device and method for generating various ring tones in radio terminal | |||
| 232 | 6418323 | Wireless mobile phone with Morse code and related capabilities | |||
| 233 | 6418309 | Apparatus and method for configuring settings of a portable intelligent communications device during a meeting | |||
| 234 | 6411198 | Portable terminal device | |||
| 235 | 6408187 | Method and apparatus for determining the behavior of a communications device based upon environmental conditions | |||
| 236 | 6408034 | Framed delta sigma data with unlikely delta sigma data patterns | |||
| 237 | 6408008 | Circuit for attenuation of echos caused by line variations and an interfacing system for capacitively coupling a plurality of sources to a two-wire communication line | |||
| 238 | 6400958 | Communication network terminal supporting a plurality of applications | |||
| 239 | 6400803 | Voice over digital subscriber line call redirection for lifeline service | |||
| 240 | 6396922 | Telecommunications terminal card | |||
| 241 | 6393105 | Method and apparatus for monitoring local telephony service power on a hybrid fiber-coax network | |||
| 242 | 6393104 | Enhanced life-line service for cable telephone customers | |||
| 243 | 6389302 | Methods and apparatus for causing wireless communication devices to vibrate via piezo-ceramic vibrators | |||
| 244 | 6389288 | Mobile communication terminal capable of executing location-related services | |||
| 245 | 6389135 | Method and apparatus for deriving power from a clock signal coupled through capacitors | |||
| 246 | 6389134 | Call progress monitor circuitry and method for a communication system | |||
| 247 | 6385466 | Portable terminal device | |||
| 248 | 6385235 | Direct digital access arrangement circuitry and method for connecting to phone lines | |||
| 249 | 6377823 | Cellular mobile telephone apparatus and an alarm device therefor | |||
| 250 | 6377795 | Cellular phone with special standby feature | |||
| 251 | 6377681 | Signal line driving circuit with self-controlled power dissipation | |||
| 252 | 6373958 | Electrical/mechanical/sound converter and apparatus of electrical/mechanical/sound conversion | |||
| 253 | 6370389 | Communication network terminal supporting a plurality of applications | |||
| 254 | 6366791 | System and method for providing a musical ringing tone on mobile stations | |||
| 255 | 6363265 | Volume control for an alert generator | |||
| 256 | 6362943 | Active current limiter | |||
| 257 | 6362740 | Apparatus for providing thermal alert signal and control method thereof in skin-contact type terminal | |||
| 258 | 6359983 | Digital isolation system with data scrambling | |||
| 259 | 6359550 | Personal communication device and call process status signalling method | |||
| 260 | 6353668 | Method for optimizing stability of a line interface circuit in a telecommunications network | |||
| 261 | 6353347 | Power control circuit for a line driver | |||
| 262 | 6352451 | Jack assembly | |||
| 263 | 6351534 | Power supply for telecommunications device | |||
| 264 | 6351533 | System and method for protecting devices connected to a telephone line | |||
| 265 | 6351528 | Integrated ringer for short telephone lines | |||
| 266 | 6347133 | Telephone answering device with timer control | |||
2001 | |||||
| 267 | 6333981 | Shelf driver unit and method | |||
| 268 | 6333664 | Low operating power, high voltage ringing switch circuit | |||
| 269 | 6333459 | Isolation apparatus for electronic equipment | |||
| 270 | 6332075 | Use of distinctive ringing in a wireless communication system to inform a called party of an increased billing rate | |||
| 271 | 6330330 | External resistor and method to minimize power dissipation in DC holding circuitry for a communication system | |||
| 272 | 6330328 | Modular digital telephone system and method including an universal telephony shelf | |||
| 273 | 6324412 | Telephone and module having a pin for providing temperature information and generating a silent alarm | |||
| 274 | 6323758 | Vibration generating unit | |||
| 275 | 6322400 | Battery termination panel | |||
| 276 | 6317593 | Intelligent cellular telephone function | |||
| 277 | 6317032 | Apparatus for informing a user of predetermined condition by vibration | |||
| 278 | 6314306 | Text message originator selected ringer | |||
| 279 | 6310954 | Ringer circuit | |||
| 280 | 6308086 | Portable cellular phone with custom melody ring setting capability | |||
| 281 | 6307891 | Method and apparatus for freezing a communication link during a disruptive event | |||
| 282 | 6304765 | Foldable communication device and method | |||
| 283 | 6304656 | Power supplying to CPU of telephone | |||
| 284 | 6304170 | Alerting apparatus | |||
| 285 | 6301358 | Dual-slope current battery-feed circuit | |||
| 286 | 6298133 | Telephone line interface architecture using ringer inputs for caller ID data | |||
| 287 | 6298132 | Ringing-tone control device for telephone set, using audio signal sent by caller | |||
| 288 | 6292668 | Communication network terminal supporting a plurality of applications | |||
| 289 | 6289070 | Digital isolation system with ADC offset calibration including coarse offset | |||
| 290 | 6285891 | Radio communication apparatus having a plurality of communication functions | |||
| 291 | 6278778 | System and method of power limiting call processing in telecommunications equipment | |||
| 292 | 6275690 | Cellular mobile telephone apparatus | |||
| 293 | 6272331 | 2-way radio with silent annunciation | |||
| 294 | 6271764 | Incoming call alerting method for a radio communication apparatus connected to an external apparatus | |||
| 295 | 6269256 | Foldable portable telephone set with automatic off-hook function | |||
| 296 | 6263218 | Incoming calling system | |||
| 297 | 6263074 | User programmable station set bass and treble control | |||
| 298 | 6263071 | Telecommunications functions management system providing distinctive alerting based on caller selected option | |||
| 299 | 6263015 | Analog/digital integrated subscriber circuit | |||
| 300 | 6259935 | Electro-mechanical-acoustic transducing device | |||
| 301 | 6255936 | Beeper security system | |||
| 302 | 6252784 | Power amplifier with feedback | |||
| 303 | 6252516 | Radio with silent and audible alerts | |||
| 304 | 6252515 | Radio with silent and audible alerts | |||
| 305 | 6246889 | System, method, and apparatus for delayed call answering | |||
| 306 | 6246761 | Automatic volume control for a telephone ringer | |||
| 307 | 6243399 | Ring signal generator | |||
| 308 | 6240176 | Method to alert a phone operator by magnetic means of an incoming call | |||
| 309 | 6239648 | System and method for dissipating heat in an electric device | |||
| 310 | 6233335 | Battery switching subscriber loop interface circuit | |||
| 311 | 6229985 | Communication apparatus | |||
| 312 | 6229845 | Bus driver with data dependent drive strength control logic | |||
| 313 | 6226536 | Charger capable of controlling alerting means and radio equipment consisting of the charger and a portable radio apparatus | |||
| 314 | 6226379 | Telecommunications functions management system providing distinctive alerting based on caller identifier | |||
| 315 | 6225897 | Telephone in-use indicator system | |||
| 316 | 6222922 | Loop current monitor circuitry and method for a communication system | |||
| 317 | 6218958 | Integrated touch-skin notification system for wearable computing devices | |||
| 318 | 6216017 | Separable cellular telephone and method for operating the same | |||
| 319 | 6215993 | Caller ID preview for mobile telephones | |||
| 320 | 6215633 | Active current limiter | |||
| 321 | 6208237 | Electro-mechanical and acoustic transducer for portable terminal unit | |||
| 322 | 6201865 | Digital access arrangement circuitry and method for connecting to phone lines having a DC holding circuit with switchable time constants | |||
| 323 | 6198816 | Capacitively coupled ring detector with power provided across isolation barrier | |||
| 324 | 6195572 | Wireless communications assembly with variable audio characteristics based on ambient acoustic environment | |||
| 325 | 6191684 | Remote supply circuitry | |||
| 326 | 6190227 | Incoming call reporting toy | |||
| 327 | 6188916 | Communication system of portable communication terminal, incoming call control system of portable communication terminal and incoming call notifying device of portable communication terminal | |||
| 328 | 6188909 | Communication network terminal supporting a plurality of applications | |||
| 329 | 6188567 | Power distribution apparatus and method | |||
| 330 | 6181237 | Method and apparatus for generating pressure based alerting signals | |||
| 331 | 6178230 | System and method for identifying a callee of an incoming telephone call | |||
| 332 | 6176710 | Battery feed connector for network power controllers | |||
| 333 | 6175721 | Communication device having incoming indicators | |||
2000 | |||||
| 334 | 6167288 | Folded-type portable telephone set | |||
| 335 | 6167135 | Method and apparatus for generating a ringing signal | |||
| 336 | 6167134 | External resistor and method to minimize power dissipation in DC holding circuitry for a communication system | |||
| 337 | 6167132 | Analog successive approximation (SAR) analog-to-digital converter (ADC) | |||
| 338 | 6166621 | Method and apparatus for displaying a message which has been received | |||
| 339 | 6160887 | Telephone loop-current regulator | |||
| 340 | 6160885 | Caller ID circuit powered through hookswitch devices | |||
| 341 | 6160489 | Wireless communication device adapted to generate a plurality of distinctive tactile alert patterns | |||
| 342 | 6157716 | Power feed circuit providing both on-hook and off-hook power for telephone subscriber loop | |||
| 343 | 6154666 | Wireless communications assembly with variable audio characteristics based on ambient acoustic environment | |||
| 344 | 6148180 | Radio communication apparatus | |||
| 345 | 6148076 | Method and an arrangement for controlling the operating mode of a subscriber line interface circuit | |||
| 346 | 6144737 | Trunk interface circuit having function of battery feed to central office | |||
| 347 | 6144736 | T1 channel bank control and apparatus | |||
| 348 | 6144326 | Digital isolation system with ADC offset calibration | |||
| 349 | 6137189 | Line circuit apparatus for supplying power to a telephone set in telecommunication systems | |||
| 350 | 6134323 | Telecommunications system, an automatic branch exchange, a line card, a supply circuit for a telecommunications line, and a telecommunications subscriber device | |||
| 351 | 6134320 | Telecommunications functions management system providing selective alerting based on caller identifier | |||
| 352 | 6134310 | Telecommunications functions management system for managing outgoing calls from a plurality of telephone terminals | |||
| 353 | 6127933 | Portable communication terminal | |||
| 354 | 6125264 | Telephone apparatus | |||
| 355 | 6122367 | Subscriber line interface circuit | |||
| 356 | 6122353 | Method and apparatus for detecting a telephone CPE alerting signal | |||
| 357 | 6119090 | Subscriber line interface circuit which automatically adjusts the signal headroom on a telephone line and a method of doing the same | |||
| 358 | 6119022 | System for alerting portable communication device user of incoming call | |||
| 359 | 6116961 | Jack assembly | |||
| 360 | 6115469 | Telephone line ring signal and DC power generator | |||
| 361 | 6108532 | Incoming call control based on the moving speed of a radio communications apparatus | |||
| 362 | 6104794 | Architecture for minimum loop current during ringing and caller ID | |||
| 363 | 6094587 | Programming of a telephone's ringing tone | |||
| 364 | 6084961 | Circuit for monitoring battery voltages of telephone terminal facility, using power detector temporarily activated by ringing or off-hook signal | |||
| 365 | 6084959 | Method and apparatus for controlling the ring volume of a telephone | |||
| 366 | 6078816 | Method and apparatus for establishing clear wireless communication | |||
| 367 | 6078661 | Modular network interface device | |||
| 368 | 6075998 | Communication apparatus capable of announcing reception of a call by a melody sound composed by a user | |||
| 369 | 6075856 | Subscriber circuit | |||
| 370 | 6072859 | Apparatus and method of generating voice message of caller's number in case of incoming call in telephone | |||
| 371 | 6069950 | Dual-limit current-limiting battery-feed circuit for a digital line | |||
| 372 | 6058164 | Mode-switchable telephone and mode setting and switching methods for the same | |||
| 373 | 6055445 | Wireless communication apparatus and indication control method therefor | |||
| 374 | 6055416 | Prevention of audible control signal transmission | |||
| 375 | 6049700 | Automatic volume adjustment in a wireless handset | |||
| 376 | 6049471 | Controller for pulse width modulation circuit using AC sine wave from DC input signal | |||
| 377 | 6047195 | Sound volume setting device for a portable telephone | |||
| 378 | 6044279 | Portable electronic apparatus with adjustable-volume of ringing tone | |||
| 379 | 6035211 | Dual use speaker for both voice communication and signalling | |||
| 380 | 6032058 | Cellular mobile telephone apparatus and an alarm device therefor | |||
| 381 | 6028916 | Method and apparatus for maintaining availability of lifeline telephony service on a hybrid fiber-coax network | |||
| 382 | 6028531 | Terminal units for a mobile communications system | |||
| 383 | 6026159 | Integrated ringer for short telephone lines | |||
| 384 | 6020732 | Flux cancelling transformer line circuit | |||
| 385 | 6018671 | Silent call accept | |||
| 386 | 6018654 | Method and apparatus for downloading tones to mobile terminals | |||
| 387 | 6014573 | Function for facilitating use of a double-acting communication device and a double-acting communication device | |||
1999 | |||||
| 388 | 6009167 | Double-bell ringing system of a telephone | |||
| 389 | 6006114 | Radiotelephone enabling adjustment of alerting indicator volume/level during incoming calls | |||
| 390 | 6002763 | Telephone with a mute ringer function having an automatic ringer reactivation capability | |||
| 391 | 6002761 | Multi-line programmable telephone call annunciator | |||
| 392 | 5999593 | System and method for automatic PBX detection | |||
| 393 | 5995852 | Communication terminal equipment and call incoming control method | |||
| 394 | 5991604 | Ring detecting circuit and method for wireless/wired composite telephone | |||
| 395 | 5987120 | Device for identifying line reversal/ringing signal of a telephone set | |||
| 396 | 5982598 | Protective circuit for a grounded power plant | |||
| 397 | 5978471 | Method and device for detecting a ringtrip | |||
| 398 | 5978451 | Telecommunications functions management system providing selective alerting based on caller selected option | |||
| 399 | 5970139 | T1 channel bank control process and apparatus | |||
| 400 | 5966655 | Automatic determination of audio or vibration alerting for an incoming call in a wireless handset | |||
| 401 | 5963877 | Telephone call receiver indicator | |||
| 402 | 5960367 | Incoming calling system | |||
| 403 | 5960076 | Method and apparatus for determining the deviation of longitudinal signal components from a predetermined value | |||
| 404 | 5960075 | Switchmode power converters for telephone subscriber line interface circuits | |||
| 405 | 5956626 | Wireless communication device having an electromagnetic wave proximity sensor | |||
| 406 | 5953408 | Telephone including an electromechanical transducer, method of adapting the frequency response of such a transducer and method of coding a melody | |||
| 407 | 5953407 | Distinctive ringing and distinctive call-waiting tones in an ISDN | |||
| 408 | 5946636 | Quick-recognition visual notification system for use in radiotelephones | |||
| 409 | 5943418 | Ring-trip circuit | |||
| 410 | 5940775 | Method of and apparatus for selectively generating incoming ring in digital cordless telephone | |||
| 411 | 5940501 | Counter based ringer interface | |||
| 412 | 5940500 | Series equipment with DC line hold transfer | |||
| 413 | 5930724 | Electronic apparatus with alarm function | |||
| 414 | 5926537 | Generating a distinctive ring tone for a calling party subscriber within a telecommunications network | |||
| 415 | 5926533 | Computer-based method and apparatus for controlling, monitoring, recording and reporting telephone access | |||
| 416 | 5924046 | Portable radio telephone with sound off-hook production | |||
| 417 | 5924044 | Modular communication device and method of providing communications therewith | |||
| 418 | 5918189 | Exchangeable hardware module for radiotelephone | |||
| 419 | 5912958 | On-hold device | |||
| 420 | 5912513 | Method and apparatus for reducing power dissipation in DC termination circuit | |||
| 421 | 5905786 | Console and extension telephone system | |||
| 422 | 5903448 | Four quadrant flyback converter, method of operation thereof and power plant employing the same | |||
| 423 | 5903076 | Vibration actuator for pager | |||
| 424 | 5901221 | Driving stage for driving differential amplifiers of a subscriber line interface circuit | |||
| 425 | 5901219 | Method for ring signal detection | |||
| 426 | 5898364 | Electronic equipment having vibration motor | |||
| 427 | 5898296 | Isolation regulator | |||
| 428 | 5892817 | Wireless system for alerting individual to incoming telephone call | |||
| 429 | 5889858 | Standby high voltage analog line feed | |||
| 430 | 5889509 | Communications terminal apparatus and display method thereof | |||
| 431 | 5884156 | Portable communication device | |||
| 432 | 5881148 | T1 channel bank control process and apparatus | |||
| 433 | 5881147 | Ring varying technique for a telephone | |||
| 434 | 5881129 | Self-monitoring line interface circuit | |||
| 435 | 5878354 | Portable telephone set usable as a paging receiver for remote notification and response to calls and messages | |||
| 436 | 5878133 | Digital direct current feed control for a communication system | |||
| 437 | 5877695 | Visual alarm for a communication module | |||
| 438 | 5875245 | High voltage detection circuit, bell signal detection circuit and non-ringing reception detection circuit | |||
| 439 | 5872842 | Unbalanced ringing using a balanced ringing generator of a subscriber line interface circuit | |||
| 440 | 5870684 | Radio communication apparatus with adjustable alert tone | |||
| 441 | 5870683 | Mobile station having method and apparatus for displaying user-selectable animation sequence | |||
| 442 | 5870466 | T1 channel bank control process and apparatus | |||
| 443 | 5867796 | Portable telephone set capable of being put in a holding mode by operation of a vibration unit which is for announcing reception of an incoming call to a user | |||
1998 | |||||
| 444 | 5854839 | Dual voltage, self-monitoring line circuit | |||
| 445 | 5848362 | Portable alerting unit for alerting a user to call arrival to portable radio apparatus | |||
| 446 | 5848149 | Subscriber line interface and power circuit | |||
| 447 | 5848148 | Communication apparatus | |||
| 448 | 5845190 | Cable access device and method | |||
| 449 | 5844983 | Method and apparatus for controlling a telephone ring signal | |||
| 450 | 5841853 | Telephone apparatus with interrupt call processing capability | |||
| 451 | 5838788 | Telephone ringing signal generator | |||
| 452 | 5835863 | Wireless telephone for cellular telephone system | |||
| 453 | 5828748 | Method for customizing operation of a line interface circuit in a telecommunications network | |||
| 454 | 5828728 | Telecommunications network | |||
| 455 | 5828558 | PWN controller use with open loop flyback type DC to AC converter | |||
| 456 | 5822702 | Radio receiving terminal having common receiver circuitry for both receiving a radio signal including a call number and a remote control signal | |||
| 457 | 5818927 | Circuit for controlling an on-hook voltage by the use of a balanced amplifier without supplying a constant current to the balanced amplifier | |||
| 458 | 5818923 | System and method for supressing pulse dialing feedback occurring particularly with auxiliary acoustic ringers in socket telephone systems | |||
| 459 | 5815569 | Method for controlling power losses associated with line interface circuits in telecommunications networks | |||
| 460 | 5812658 | Method and circuit for failsafe switch-hook detection during fault in a telephone system | |||
| 461 | 5812648 | Telephone ringer control device | |||
| 462 | 5809134 | Telephone interface circuit with impedance termination during call pauses | |||
| 463 | 5809131 | Ringer circuit for generating sine wave | |||
| 464 | 5806948 | Retrofittable battery cabinet for telecommunications enclosures | |||
| 465 | 5801520 | Supply voltage switching apparatus | |||
| 466 | 5796279 | DC application circuit with suppressed DC magnetization | |||
| 467 | 5790654 | Digitally controlled ring signal generator | |||
| 468 | 5787365 | Apparatus for combining cellular telephone ring signals and PSTN ring signals | |||
| 469 | 5787168 | Mobile telephone fastening with vibration function | |||
| 470 | 5786106 | Battery pack with interchangeable tag-along supplemental feature cartridge particularly for cellular telephones | |||
| 471 | 5784001 | Method and apparatus for presenting graphic messages in a data communication receiver | |||
| 472 | 5777463 | Device for auto-adapting to the impedance of a supply line | |||
| 473 | 5768368 | T1 channel bank control process and apparatus | |||
| 474 | 5767787 | Reduced size radio selective call receiver with a tactile alert capability by sub-audible sound | |||
| 475 | 5767778 | Event sensing circuit and alert generator | |||
| 476 | 5764755 | Ring-signal generation in a SLIC | |||
| 477 | 5764751 | Portable telephone set with a vibrator having an automatic switching function | |||
| 478 | 5764730 | Radiotelephone having a plurality of subscriber identities and method for operating the same | |||
| 479 | 5754644 | Method for customizing operation of a battery feed circuit in a telecommunications network | |||
| 480 | 5752203 | Portable radio apparatus having cable-incorporated hand strap | |||
| 481 | 5745563 | Telephone subscriber line circuit, components and methods | |||
| 482 | 5740241 | T1 channel bank control process and apparatus | |||
| 483 | 5737411 | Battery switching in a telephone subscriber line interface circuit | |||
| 484 | 5734714 | Subscriber line interface circuit capable of realizing by a C-MOS circuit | |||
| 485 | 5734712 | Method for off-hook detection during ringing and the use of a subscriber line interface circuit for off-hook detection during ringing | |||
| 486 | 5734711 | Telecommunication system with energy-saving mode | |||
| 487 | 5729589 | Apparatus and method for incoming call detection and alarm circuitry for cellular telephones | |||
| 488 | 5724468 | Electronic backplane device for a fiber distribution shelf in an optical fiber administration system | |||
| 489 | 5724411 | Method for selectively alerting multiple telephones of an incoming call | |||
| 490 | 5723996 | Leadframe for plastic-encapsulated semiconductor device, semiconductordevice using the same, and manufacturing method for the leadframe | |||
| 491 | 5722071 | Portable receiver including transducer for notifying user of messages received in a remote mobile communications device | |||
| 492 | 5721774 | Longitudinally balanced, dual voltage line-feed circuit | |||
| 493 | 5719929 | Generalizing specialized telephone numbers | |||
| 494 | 5712910 | Ring trip circuit having a simple trip detecting circuit of a high response speed | |||
| 495 | 5712779 | DC electrical power supply system | |||
| 496 | 5706343 | Integrated interface circuit for driving a subscriber line | |||
| 497 | 5706157 | Power distribution system with over-current protection | |||
1997 | |||||
| 498 | 5703931 | Portable radio telephone with impulse movement or sound off-hook production and signalling | |||
| 499 | 5699422 | Telecommunication device | |||
| 500 | 5699420 | Bell sound synthesizer | |||
| 501 | 5696817 | Apparatus and method for determining the source of a telephone communication | |||
| 502 | 5696497 | Radio with silent and audible alerts | |||
| 503 | 5694465 | Integrated ringer for short telephone lines | |||
| 504 | 5687227 | Telephone with user recorded ringing signal | |||
| 505 | 5684874 | Ringtrip judging circuit | |||
| 506 | 5682423 | Electrical power and telephone ringer signal distribution system | |||
| 507 | 5675640 | Telephone ringing signal detector | |||
| 508 | 5671272 | Current mode ring trip detector | |||
| 509 | 5666406 | Hazard prevention for telephone line interface circuits | |||
| 510 | 5666397 | Individual telephone line call event buffering system | |||
| 511 | 5666355 | Power consumption control method and apparatus for a communication system subscriber unit | |||
| 512 | 5664002 | Method and apparatus for providing power to a coaxial cable network | |||
| 513 | 5663878 | Apparatus and method for generating a low frequency AC signal | |||
| 514 | 5661794 | Telephone line interface circuit with voltage control | |||
| 515 | 5661791 | Method and apparatus for enhanced distinctive call redirection | |||
| 516 | 5661788 | Method and system for selectively alerting user and answering preferred telephone calls | |||
| 517 | 5659610 | Battery feed circuit | |||
| 518 | 5659608 | Line feed circuit with logic level controlled ringing | |||
| 519 | 5655016 | Distinctive telephone annunciator | |||
| 520 | 5655013 | Computer-based method and apparatus for controlling, monitoring, recording and reporting telephone access | |||
| 521 | 5654592 | Power supply controller | |||
| 522 | 5651052 | Apparatus and method for incoming call detection and alarm circuitry for cellular telephones | |||
| 523 | 5649020 | Electronic driver for an electromagnetic resonant transducer | |||
| 524 | 5649009 | Differential longitudinal amplifier for a subscriber line interface circuit | |||
| 525 | 5649007 | Telephone set of distinctive ringing type capable of generating different calling sounds after the telephone set is connected to remote calling party | |||
| 526 | 5649006 | Communication apparatus having function of generating calling signal | |||
| 527 | 5649002 | Method and apparatus for detecting a telephone CPE alerting signal | |||
| 528 | 5642413 | Telephone call alert device with selectable alert modes | |||
| 529 | 5642412 | Isolated high impedance, DC current sources for telecommunications applications | |||
| 530 | 5640441 | Apparatus and method for incoming call detection and alarm circuitry for cellular telephones | |||
| 531 | 5638421 | Apparatus and method for incoming call detection and alarm circuitry for cellular telephones | |||
| 532 | 5636274 | Switch controller and method | |||
| 533 | 5636273 | Integrated ring detection circuit and power cross detection circuit with persistence timers | |||
| 534 | 5635897 | Mobile phone alarm | |||
| 535 | 5629931 | Information transmission system | |||
| 536 | 5627491 | Plural stage circuit with automatic adaptation to first and second voltage ranges of a common voltage source | |||
| 537 | 5625683 | Method of and telephone with call-reminding and auto-dialing | |||
| 538 | 5619568 | Cordless phone with time-out controlled ringer | |||
| 539 | 5619567 | Variable DC feed characteristic in a subscriber line interface circuit | |||
| 540 | 5617472 | Noise suppression of acoustic signal in telephone set | |||
| 541 | 5612998 | Integrated interface circuit for driving a subscriber line | |||
| 542 | 5610978 | Ring discriminator | |||
| 543 | 5602911 | System and method for eliminating bell tap on analog telephones | |||
| 544 | 5602908 | Calling party identifying apparatus and method therefor | |||
| 545 | 5602900 | Radio Telecommunication apparatus | |||
| 546 | 5600713 | On-board ring signal generator | |||
| 547 | 5598461 | Personalized annunciation signaling phone unit | |||
| 548 | 5596637 | Power dissipation manager circuit for an interface device feeding a subscriber telephone line | |||
1996 | |||||
| 549 | 5583934 | DC level control for an electronic telephone line card | |||
| 550 | 5579535 | Personal communication system providing supplemental information mode | |||
| 551 | 5579386 | Telephone network alerting cadence control system | |||
| 552 | 5577104 | Method for system and message activation based on distinctive ringing | |||
| 553 | 5574772 | Personal apparatus for receiving radiotelephone communications | |||
| 554 | 5570421 | Method and apparatus for controlling the drive frequency of a LED | |||
| 555 | 5570025 | Annunciator and battery supply measurement system for cellular telephones | |||
| 556 | 5570003 | Switching device with a feeding circuit for DC power supply to a subscriber's terminal unit | |||
| 557 | 5561704 | Proximity based toll free communication services | |||
| 558 | 5557658 | Communications marketing system | |||
| 559 | 5555301 | Power supply apparatus and method for energizing telephone alerting mechanisms and circuitry | |||
| 560 | 5553132 | Method and an arrangement for generating a ringing signal | |||
| 561 | 5553125 | Telephone apparatus with calling line identification | |||
| 562 | 5548592 | Home and small business phone system for operation on a single internal twisted pair line and methodology for operating the same | |||
| 563 | 5546025 | Low frequency discrimator using upper and lower thresholds | |||
| 564 | 5544241 | Telephone ring detector | |||
| 565 | 5543669 | Remote feed circuit in communication systems | |||
| 566 | 5541543 | Regulating device for a telephone loud-speaker | |||
| 567 | 5539805 | Power supply system including ringing voltage reset under low input voltage conditions | |||
| 568 | 5537657 | Telecommunications device with means for learning and responding to a distinctive ring cadence | |||
| 569 | 5535273 | Circuitry for superimposing small, low energy signals and large, essentially higher energy signals | |||
| 570 | 5535272 | Sensor circuit for a telephone line | |||
| 571 | 5530931 | Method and apparatus for providing a look ahead feature for enhanced call forwarding in a telecommunications system | |||
| 572 | 5528697 | Integrated vibrating and sound producing device | |||
| 573 | 5528688 | Telephone battery feed circuit including noise reduction circuit | |||
| 574 | 5528682 | Double duty capacitor circuit and method | |||
| 575 | 5526418 | Ringer circuit | |||
| 576 | 5524061 | Dual mode transducer for a portable receiver | |||
| 577 | 5521964 | Visual message waiting indication in a telephone voice message system | |||
| 578 | 5519775 | Device for electrical and/or electronic telephone circuits, designed to limit the power dissipated within them | |||
| 579 | 5517565 | Integrated ringer relay circuit and method | |||
| 580 | 5515434 | Impedance setting circuit for a SLIC | |||
| 581 | 5515433 | Resistance forward telephone line feed circuit | |||
| 582 | 5515417 | Ground key detector for a SLIC | |||
| 583 | 5511118 | Method of providing d.c. feed to a telephone line | |||
| 584 | 5509068 | Electronic ring monitoring device for telecommunications line | |||
| 585 | 5500895 | Telephone isolation device | |||
| 586 | 5500893 | Telephone apparatus, information processing apparatus and information communication terminal | |||
| 587 | 5493611 | User configurable telephone with alarm feature | |||
| 588 | 5491746 | Unique ringing on a prime telephone | |||
| 589 | 5490054 | Ringing generator and method for converting DC to AC having continuously adjustable amplitude | |||
| 590 | 5485516 | Line termination for a telephone line | |||
| 591 | 5483592 | Ringer unit driving system in a subscriber transmission system | |||
| 592 | 5483574 | Communication terminal equipment | |||
| 593 | 5481599 | Automated audio output device for a telephone set | |||
1995 | |||||
| 594 | 5479476 | Mobile telephone having groups of user adjustable operating characteristics for facilitating adjustment of several operating characteristics | |||
| 595 | 5469282 | Power supply system for optical network unit of a fiber in the loop | |||
| 596 | 5467384 | Method and apparatus for providing power to a coaxial cable network | |||
| 597 | 5459783 | Acoustic feedback suppression device particulary for auxiliary ringers in plug-in telephone systems | |||
| 598 | 5457741 | Subscriber transmission system | |||
| 599 | 5454032 | Method of establishing communication link to one of multiple devices associated with single telephone number | |||
| 600 | 5452354 | Ringing tone apparatus | |||
| 601 | 5450618 | Full duplex and half duplex communication unit with volume setting | |||
| 602 | 5450613 | Mobile communications equipment which detects and notifies when it is moved into or out of a service area | |||
| 603 | 5448620 | Volume control for a dual mode communications device | |||
| 604 | 5446785 | Telephone terminal equipment in which telephone numbers of callers are displayed | |||
| 605 | 5444777 | Battery feed for telephone line cards | |||
| 606 | 5442695 | Ringer circuit | |||
| 607 | 5442694 | Ring tone detection for a telephone system | |||
| 608 | 5442692 | Telecommunication system having a capability of changing the alerting tone | |||
| 609 | 5440262 | High-efficiency Ring/MWL generator | |||
| 610 | 5436964 | Programmable call progress tones for a switching system | |||
| 611 | 5428682 | Subscriber line interface circuit with reduced on-chip power dissipation | |||
| 612 | 5428670 | Communications marketing system | |||
| 613 | 5426695 | Ringing signal control circuit capable of suppressing surge voltage | |||
| 614 | 5422948 | Subscriber line interface for improving the frequency characteristics of the transmitted and received signals | |||
| 615 | 5422656 | Personal communicator having improved contrast control for a liquid crystal, touch sensitive display | |||
| 616 | 5414309 | Circuit for applying direct current to winding | |||
| 617 | 5406623 | Method and apparatus for ringing telephone stations | |||
| 618 | 5404582 | Aural annunciator circuit for a receiver | |||
| 619 | 5404399 | Telephone visual signaling device | |||
| 620 | 5404391 | Incoming call alert system for cellular telephones without wired connection thereto | |||
| 621 | 5402485 | Two-wire termination impedance generation circuit of subscriber circuit | |||
| 622 | 5402484 | Telephone circuit assembly | |||
| 623 | 5402482 | Ring trip deciding circuit | |||
| 624 | 5402480 | Call signal generating circuit | |||
| 625 | 5396555 | Power and signal transmission system | |||
| 626 | 5396548 | Communication system utilizing information received during a silent interval between ringing signals | |||
| 627 | 5392347 | Ringing tone signal detecting circuit | |||
| 628 | 5390249 | Receiver device for receiving ringing signals in an off-hook line condition | |||
| 629 | 5388150 | Automatic incoming telephone call identification and disposition system | |||
| 630 | 5379032 | Impulse transducer enunciator | |||
1994 | |||||
| 631 | 5369698 | Woodpecker simulating telephone ringing device | |||
| 632 | 5369690 | Telephone call detecting circuit and a method of remotely accessing and testing a telephone | |||
| 633 | 5369518 | Optical communication system and method electrical power transmission for thereof | |||
| 634 | 5367567 | Subscriber apparatus with ringer generator for sending ringer signal to subscriber line | |||
| 635 | 5363431 | Visual message waiting indication in a telephone voice message system | |||
| 636 | 5361300 | Balancing resistor and thermistor network for telephone circuits, and combination thereof with relay | |||
| 637 | 5359655 | Supply circuit for a telecommunication line, providing highly symmetrical and rapid response to line voltage disturbances | |||
| 638 | 5355401 | Method and apparatus for providing telephony power through a coaxial cable network | |||
| 639 | 5347577 | Battery feed circuit for supplying feed current to telephone set | |||
| 640 | 5347565 | Order wire device having function for reducing noise in communication system having a plurality of order wire devices | |||
| 641 | 5343520 | Impedance synthesis multile loop using filtering means | |||
| 642 | 5343084 | Variable level periodic excitation circuit for a capacitive load | |||
| 643 | 5341108 | Amplifier biasing circuit | |||
| 644 | 5337356 | Ringing circuit for use in portable telephone set | |||
| 645 | 5337354 | Tip-ring voltage correction circuit | |||
| 646 | 5335272 | Method and arrangement for supplying direct current to a telephone line | |||
| 647 | 5335271 | Ring trip detection circuit | |||
| 648 | 5335270 | Bell signal generating circuit | |||
| 649 | 5333196 | Current limiting battery feed arrangement | |||
| 650 | 5333192 | Line interface circuit | |||
| 651 | 5333190 | Telephone ring detection method and apparatus | |||
| 652 | 5329588 | Telecommunication line circuit | |||
| 653 | 5329585 | Subscriber line interface circuit for controlling AC and DC output impedance | |||
| 654 | 5329584 | Interface circuit to quickly establish a loop current | |||
| 655 | 5329577 | Telephone having touch sensor for responding to a call | |||
| 656 | 5323461 | Telephone line interface circuit with voltage switching | |||
| 657 | 5323460 | Enhanced subscriber line interface circuit | |||
| 658 | 5323456 | Digitally controlled ringer signal generation | |||
| 659 | 5323455 | Ringer circuit, particularly for a telephone set | |||
| 660 | 5323453 | Power down feed | |||
| 661 | 5321740 | Telephone marketing system | |||
| 662 | 5321596 | DC/DC/AC power supply for a subscriber interphase unit | |||
| 663 | 5317622 | Ringing circuit for use in a telephone set for detecting a mobile mode or a portable mode of the telephone set | |||
| 664 | 5315653 | Current limited subscriber interface circuit | |||
| 665 | 5313661 | Method and circuit arrangement for adjusting the volume in a mobile telephone | |||
| 666 | 5311518 | ISDN interface circuit and system using the same | |||
| 667 | 5307407 | 20 Hz ring generator using high frequency PWM control | |||
| 668 | 5307406 | ISDN power source detection circuit | |||
| 669 | 5303284 | Ringing circuit for use in portable telephone set | |||
| 670 | 5295185 | Ringing signal generation circuit with protection against overvoltage | |||
| 671 | 5293420 | Ring trip circuit | |||
| 672 | 5280523 | Telephone line message waiting and ring indicator | |||
1993 | |||||
| 673 | 5274704 | Transformer telephone line interface circuit | |||
| 674 | 5274703 | Automatic loss control circuit | |||
| 675 | 5274702 | Wideband telephone line interface circuit | |||
| 676 | 5274701 | Telephone alerter | |||
| 677 | 5260996 | Current limited electronic ringing generator | |||
| 678 | 5260992 | Key telephone system with reduction of delay of ring tone generation at telephone set | |||
| 679 | 5260937 | Power conserving technique for a communications terminal time slot interchanger | |||
| 680 | 5255317 | Subscriber line interface circuit for serving ISDN subscribers using echo cancellers and POTS subscribers | |||
| 681 | 5253290 | Circuit arrangement for the transmission of telecommunication signals | |||
| 682 | 5253289 | Terminal connection device | |||
| 683 | 5249226 | Apparatus for controlling a current supply device | |||
| 684 | 5247573 | Telecommunications system comprising a circuit arrangement for at least one subscriber station | |||
| 685 | 5233649 | Telephone ringing module | |||
| 686 | 5233641 | Radio telephone equipment having a sounding device for generating alert tone indicative of response of called subscriber | |||
| 687 | 5230018 | Communication system for activating an optical display in a communication terminal of a communication switching station | |||
| 688 | 5228081 | Ringing signal control circuit for an enhanced subscriber line interface | |||
| 689 | 5224154 | Line powered DCA including dual programmed microcontrollers | |||
| 690 | 5218634 | Ringer assembly | |||
| 691 | 5216708 | Calling signal controller | |||
| 692 | 5216707 | Circuit for firing paystation coin relay using power derived from telephone line tip/ring voltage | |||
| 693 | 5216704 | Method for remote power fail detection and maintaining continuous operation for data and voice devices operating over local loops | |||
| 694 | 5214692 | Bypass for telephone switching system | |||
| 695 | 5202917 | Telephone calling method and telephone apparatus | |||
| 696 | 5201068 | Radio telecommunications apparatus | |||
| 697 | 5195128 | Communication system, particularly a telephone communication system | |||
| 698 | 5191507 | Polarity inverting circuit | |||
| 699 | 5189697 | Line interface circuit | |||
| 700 | 5185738 | Fiberoptic telephone systems | |||
| 701 | 5181023 | Terminal unit of a mobile communication system | |||
| 702 | 5180987 | DC-to-AC symmetrical sine wave generator | |||
1992 | |||||
| 703 | 5175764 | Enhanced high voltage line interface circuit | |||
| 704 | 5172409 | Precision FET control loop | |||
| 705 | 5172408 | Speakerphone state-controlled alerting arrangement | |||
| 706 | 5172092 | Selective call receiver having audible and tactile alerts | |||
| 707 | 5163090 | Over-current verifier circuit for an enhanced subscriber line interface | |||
| 708 | 5159627 | Adaptive ringer for telephone terminal | |||
| 709 | 5157721 | Control circuit for an electrical telephone accessory | |||
| 710 | 5157711 | Telephone terminal device | |||
| 711 | 5148475 | Reduced contact resistance on a SLIC | |||
| 712 | 5142569 | Apparatus for selectively enabling subscriber device to respond to ringing signal in dependence upon ringing cadence | |||
| 713 | 5140630 | Added main line apparatus | |||
| 714 | 5138658 | Subscriber line interface circuit providing regulated current | |||
| 715 | 5136630 | Intrinsically safe telephone | |||
| 716 | 5131033 | Sealing current generator for a telephone circuit | |||
| 717 | 5128992 | Hybrid circuit | |||
| 718 | 5128981 | Radio communication system and a portable wireless terminal | |||
| 719 | 5117449 | Dual receiver apparatus for integrated paging and radiotelephone functions | |||
| 720 | 5113426 | Ground fault detector | |||
| 721 | 5103387 | High voltage converter | |||
| 722 | 5099513 | Integrated circuit for generating a melody and ring | |||
| 723 | 5097503 | Electronic subscriber line connection circuit | |||
1991 | |||||
| 724 | 5073922 | Communication terminal apparatus | |||
| 725 | 5056135 | Method of automatic equalized distribution of ring loads for telephone exchange system | |||
| 726 | 5052039 | Line interface circuit | |||
| 727 | 5051730 | Circuit arrangement for charging rectifiers for DC energy storage devices in telecommunications systems, particularly telephone switching systems | |||
| 728 | 5050210 | Metallic current limiter | |||
| 729 | 5046089 | Subscriber line interface circuit with power-down mode | |||
| 730 | 5040209 | Telephone ringing monitoring and control system | |||
| 731 | 5027391 | Call management system | |||
| 732 | 5025467 | Cellular telephone ring annunciator | |||
| 733 | 5020102 | Semi-floating AC/DC active termination circuit with current sink | |||
| 734 | 5014305 | Line interface circuit | |||
| 735 | 5010566 | Cordless telephone | |||
| 736 | 5001748 | Ringing signal generator | |||
| 737 | 4998273 | Telephone line called number recognizer | |||
| 738 | 4998271 | Telephone accessory | |||
| 739 | 4995111 | Ring trip circuit for subscriber telephone | |||
| 740 | 4995075 | Apparatus and method for encoding telephone ringing signals | |||
| 741 | 4993064 | Subscriber line interface circuit and transformer therefor northern telecom limited | |||
| 742 | 4985912 | Radio telephone device | |||
| 743 | 4982426 | Telecommunications line interface circuits | |||
| 744 | 4982422 | Terminating circuit in a battery feed circuit of an electronic exchange system | |||
1990 | |||||
| 745 | 4972466 | Digital composite tone alerting | |||
| 746 | 4972452 | Digital bypass for telephone system | |||
| 747 | 4969186 | Telephone message waiting system and apparatus | |||
| 748 | 4969180 | Cordless pen telephone handset | |||
| 749 | 4965692 | Overload detector and protection circuit | |||
| 750 | 4964158 | Power supply for telephone exchange | |||
| 751 | 4962545 | Volume level retention in a pager | |||
| 752 | 4962527 | Series ringing signal generator | |||
| 753 | 4962520 | Composite ringing and coin control voltage detector and method | |||
| 754 | 4961222 | Apparatus in a telecommunication system for supplying power to a telephone set | |||
| 755 | 4961219 | Circuit for synthesizing an impedance across the tip and ring leads of a telephone line circuit | |||
| 756 | 4959853 | Frequency responsive selective ringing circuit | |||
| 757 | 4955053 | Solid state ringing switch | |||
| 758 | 4951039 | Animated data display interleaving | |||
| 759 | 4942600 | Communication apparatus for generating a call signal from a telephone set to a data terminal | |||
| 760 | 4939775 | Telephone ringing detector | |||
| 761 | 4935960 | Battery feed circuit | |||
| 762 | 4926467 | Line card with distributed signaling voltages | |||
| 763 | 4926459 | Hearing assist telephone | |||
| 764 | 4924511 | Ring signal generator for generating ring signals of different frequencies and power levels in response to user selection | |||
| 765 | 4924193 | Volume control circuit for use in portable telephone or the like | |||
| 766 | 4922531 | Line interface circuit | |||
| 767 | 4922527 | Small electronic apparatus | |||
| 768 | 4920561 | Ring detector for telephone line | |||
| 769 | 4916734 | Apparatus for separating dc current and ac current components of a composite signal | |||
| 770 | 4914693 | Telephone subscriber circuit | |||
| 771 | 4910769 | Telephone line interface circuit | |||
| 772 | 4908857 | Isolated drive circuit | |||
| 773 | 4908856 | Switching voltage regulator for an interface circuit in a telephone subscriber line | |||
| 774 | 4908854 | Apparatus for connecting and disconnecting a ringing signal to a called subscriber | |||
| 775 | 4899382 | Telephone circuit using DC blocked transformer and negative impedance technique | |||
| 776 | 4897872 | Interface circuit between a subscriber's telephone line and exchange control components, with reduced current consumption in the case of a grounded cable | |||
| 777 | 4896351 | Apparatus for separating dc current and ac current components of a composite signal | |||
1989 | |||||
| 778 | 4884294 | Portable cordless telephone set for outputting various discriminiation sounds with simple circuit construction | |||
| 779 | 4875232 | Telephone power distribution and isolation system | |||
| 780 | 4872199 | Battery-feed circuit for exchange | |||
| 781 | 4866768 | Station line interface circuit for a telecommunication network | |||
| 782 | 4866767 | Subscriber line interface circuit | |||
| 783 | 4866766 | Telephone device having customized ring capability | |||
| 784 | 4866587 | Electronic ringing signal generator | |||
| 785 | 4864609 | Telephone line interface circuit | |||
| 786 | 4862495 | Telecommunications subscriber line interface circuit and party identification facility | |||
| 787 | 4862309 | Protection circuit for battery feed circuit | |||
| 788 | 4860287 | Network having a synchronizer for synchronization between a primary and a remote station | |||
| 789 | 4856059 | Semiconductor subscriber line interface circuit with enhanced survivability | |||
| 790 | 4856056 | Apparatus for timely controlling the sound characteristic of a signaling means of a voice communication device | |||
| 791 | 4856055 | Controllable telephone annunciator | |||
| 792 | 4853959 | Method and apparatus for feeding power to a telephone line such that for restricted battery voltage there is enabled the transmission of an undistorted speech signal | |||
| 793 | 4852162 | Subscriber line interface circuit | |||
| 794 | 4849850 | Circuit for protecting electronic devices against overload | |||
| 795 | 4847896 | Monolithically integratable telephone circuit for supplying ringing signals to a subscriber's telephone line and for detecting an off the hook condition during ringing | |||
| 796 | 4841565 | Monolithically integratable telephone circuit for feeding a subscriber's telephone line | |||
| 797 | 4841564 | DC-supply arrangement for a telecommunication line | |||
| 798 | 4837818 | Telecommunication line circuit | |||
| 799 | 4833709 | Remote telephone signaling circuitry and device | |||
| 800 | 4829567 | Line interface circuit | |||
| 801 | 4827505 | Subscriber line interface circuit | |||
| 802 | 4827503 | Integrated ringing circuit and a ring trip circuit for the same | |||
| 803 | 4821315 | Electronic contacts and associated devices | |||
| 804 | 4821314 | Message and ringing signaling device for a telephone installation | |||
| 805 | 4809258 | Circuit arrangement for the indication of loop closure during the ringing condition | |||
| 806 | 4805213 | Ring detector | |||
| 807 | 4803721 | DC control circuit | |||
| 808 | 4800589 | Voltage regulator control circuit for a subscriber line interface circuit | |||
| 809 | 4800586 | Compensation circuit for use with an integrating amplifier | |||
| 810 | 4799144 | Multi-function communication board for expanding the versatility of a computer | |||
| 811 | 4797917 | Monolithically integratable telephone circuit for supplying ringing signals to a subscriber's telephone line and for detecting an off the hook condition during ringing | |||
1988 | |||||
| 812 | 4789999 | Line circuit for coupling a subscriber set to a switching facility to provide a complex impedance match | |||
| 813 | 4782518 | Apparatus for converting distinctive ring to selective ring in telephone lines | |||
| 814 | 4780696 | Multifilar transformer apparatus and winding method | |||
| 815 | 4767980 | Inductance multiplier circuit | |||
| 816 | 4764956 | Active impedance line feed circuit | |||
| 817 | 4761812 | Constant power telephone line circuit | |||
| 818 | 4760595 | Subscriber line interface circuit having means for combining DC and AC feedback signals | |||
| 819 | 4757528 | Thermally coupled information transmission across electrical isolation boundaries | |||
| 820 | 4752952 | Subscriber circuit link interface for an automatic telephone exchange | |||
| 821 | 4748659 | Calling signal transmission apparatus | |||
| 822 | 4748652 | Circuit for detecting abnormality in feeder | |||
| 823 | 4741031 | Intrinsically safe telephone | |||
| 824 | 4737989 | Ringing circuit | |||
| 825 | 4737988 | Current supply circuit | |||
| 826 | 4737987 | Circuit for evaluating call signals in a telecommunication system | |||
| 827 | 4737732 | Low voltage operational amplifier having a substantially full range output voltage | |||
| 828 | 4736415 | Resistive line feed circuit | |||
| 829 | 4736412 | Method of and circuit arrangement for evaluating the output signals of current flow detectors in telecommunication facilities | |||
| 830 | 4734937 | Telephone installation | |||
| 831 | 4734936 | Ringing signal sending-out circuit | |||
| 832 | 4734933 | Telephone line status circuit | |||
| 833 | 4731828 | Ring trip detection in telecommunications exchanges | |||
| 834 | 4731827 | Interswitch line circuit | |||
| 835 | 4727574 | Subscriber line interface circuit with improved d.c. balance | |||
| 836 | 4727572 | Telephone annunciator with low battery indication | |||
| 837 | 4726060 | Line circuit for driving a ringer and a service indicating lamp in a telephone set | |||
| 838 | 4723280 | Constant current line circuit | |||
| 839 | 4723275 | Circuit arrangement for generating an acoustic ringing signal in a subscriber telephone set | |||
| 840 | 4718084 | Overload protection circuit for a telephone subscriber line feed circuit | |||
1987 | |||||
| 841 | 4712233 | Monolithic telephone subscriber line interface circuit | |||
| 842 | 4709388 | Subscriber telephone line interface circuit with reduced power stand-by mode | |||
| 843 | 4707855 | Personalized telephone signaling circuitry and device, and methods of constructing and utilizing same | |||
| 844 | 4706281 | Dynamic impedance element for a battery feed circuit | |||
| 845 | 4703500 | Power amplifier | |||
| 846 | 4701947 | Circuit arrangement for suppressing interference signals on the receiving arm of a telephone subscriber line circuit | |||
| 847 | 4686700 | Telephone off-hook detector circuit | |||
| 848 | 4685130 | Subscriber line circuit having an improved loop current supply circuit | |||
| 849 | 4685129 | Power transmission arrangement for telecommunications systems | |||
| 850 | 4682355 | Electronic feeding bridge for a space division switching network | |||
| 851 | 4679232 | Method and apparatus for providing a ground reference for telephone customer special circuits powered from a floating battery feed | |||
| 852 | 4679229 | Ringing detection circuit | |||
| 853 | 4679132 | Floating battery feed circuit using multifilar transformer | |||
| 854 | 4677669 | Battery feed circuit for a pair of subscriber lines | |||
| 855 | 4677664 | Method and apparatus for an improved ring trip detection telephone circuit | |||
| 856 | 4674119 | Wide-band high voltage amplifier for telephone exchange subscriber line interface utilizing low voltage control circuitry | |||
| 857 | 4665547 | Limiting amplifier for common mode feedback in telephone line feed circuits | |||
| 858 | 4661978 | Subscriber line interface circuit having an impedence synthesizer | |||
| 859 | 4658419 | Telephone ringer circuit | |||
| 860 | 4656661 | Switched capacitor coupled line receiver circuit | |||
| 861 | 4656659 | Programmable ring signal generator | |||
| 862 | 4652701 | Ringing application circuit | |||
| 863 | 4648019 | High efficiency ringing generator | |||
| 864 | 4646347 | Ringing signal reformatting circuit | |||
| 865 | 4645881 | DC level trip detector | |||
| 866 | 4644579 | Shunt regulator for hands-free telephone | |||
| 867 | 4644476 | Dialing tone generation | |||
| 868 | 4644106 | Apparatus for timely controlling the sound characteristic of a signaling means of a voice communication device | |||
| 869 | 4639551 | Regulated power supply circuit particularly for telephone set | |||
| 870 | 4636585 | Telephone installations | |||
1986 | |||||
| 871 | 4633038 | Supply circuit for a variable load, particularly for a line circuit in telephone systems | |||
| 872 | 4631366 | Battery feed circuit for subscriber line | |||
| 873 | 4631361 | Programmable ring generator | |||
| 874 | 4631360 | Apparatus for the current supply of a subscriber set from an exchange | |||
| 875 | 4631359 | Arrangement for supplying current to a subscriber telephone set | |||
| 876 | 4622442 | Electronic hybrid having synthesized impedance circuitry | |||
| 877 | 4622441 | Two-wire/four wire communication interface with noise rejection | |||
| 878 | 4622439 | Detection of ground or loop start configuration in telephone loop signalling circuit | |||
| 879 | 4617426 | Method for current supply to a subscriber telephone from a telephone exchange | |||
| 880 | 4614840 | Telecommunication line circuit and associated polarity reversal circuit | |||
| 881 | 4612417 | Electronic battery feed circuit for telephone systems | |||
| 882 | 4611097 | Sine wave ring generator | |||
| 883 | 4609782 | Solid state signal insertion circuit and method for use in a telephony system or the like | |||
| 884 | 4609781 | BORSHT/SLIC auto balancing technique | |||
| 885 | 4608461 | Subscriber circuit for a telephone network | |||
| 886 | 4607141 | Active network termination circuit | |||
| 887 | 4607140 | Build out capacitor circuit | |||
| 888 | 4605824 | Circuit arrangement for telecommunication exchange systems, particularly telephone exchange systems with switch facilities for emitting signals | |||
| 889 | 4602130 | Dual voltage source feed circuit configuration for a telephone line circuit | |||
| 890 | 4600811 | Subscriber line interface circuit | |||
| 891 | 4599494 | Ring sense telephone tone ringer circuit | |||
| 892 | 4598173 | Interface circuit for a subscriber line circuit | |||
| 893 | 4595797 | Ringing signal generator for a subscriber telephone set | |||
| 894 | 4593272 | Communication system power arrangement | |||
| 895 | 4593156 | Grounded tip detector | |||
| 896 | 4591661 | Portable cordless telephone transceiver-radio receiver | |||
| 897 | 4590334 | Supply circuit included in a DC-magnetized hybrid transformer | |||
| 898 | 4588860 | Battery feed circuit for telephone subscriber line | |||
| 899 | 4588858 | Differential amplifiers and method of differentially driving a two-wire line circuit | |||
| 900 | 4586119 | Off-line switching mode power supply | |||
| 901 | 4585905 | Overvoltage protection circuit for SLIC | |||
| 902 | 4584576 | Ringing signal generator | |||
| 903 | 4581691 | Balanced constant current sensing circuit inherently immune to longitudinal currents | |||
| 904 | 4581487 | Universal DC feed for telephone line and trunk circuits | |||
| 905 | 4578542 | Line powered flasher circuit for ringing signal | |||
| 906 | 4578541 | Telephone line interface circuit | |||
| 907 | 4577064 | Auto-balance circuit for battery feed in a telephone circuit | |||
| 908 | 4575585 | Synchronous programmable signal generator and method | |||
| 909 | 4571462 | Multiple use digital tone generator in telephone | |||
| 910 | 4571460 | Active impedance line feed circuit with improved ground fault protection | |||
| 911 | 4567333 | Electronic tone ringer with distinctive signaling circuitry | |||
| 912 | 4567331 | Electronic hybrid having synthesized impedance circuitry | |||
1985 | |||||
| 913 | 4562525 | DC Power supply circuit for line interface circuits | |||
| 914 | 4562308 | Subscriber connection circuit comprising feed resistors which can be bridged in low-ohmic fashion and an indication circuit which effects different indications | |||
| 915 | 4560843 | Electronic external line repeater | |||
| 916 | 4560835 | Power supply arrangement for applying direct current to subscriber circuits | |||
| 917 | 4560834 | Current limiter circuit for battery feed in a telephone circuit | |||
| 918 | 4558272 | Current characteristic shaper | |||
| 919 | 4558186 | Single power supply battery feed circuit | |||
| 920 | 4558183 | Opto-coupler interfacing circuit | |||
| 921 | 4555595 | Sampled port data switching system employing interactive processors | |||
| 922 | 4554412 | Resistive line circuit | |||
| 923 | 4552994 | Apparatus for isolating the voice frequency path from the floating battery feed during signalling | |||
| 924 | 4551670 | Circuit for maintaining the DC voltage on an electrically isolated telecommunication line at a reference level | |||
| 925 | 4546214 | Line use indicator for telephone sets sharing a single line | |||
| 926 | 4540853 | Apparatus for detecting a loop during ringing | |||
| 927 | 4540852 | Electronic subscriber junctor | |||
| 928 | 4539438 | Active impedance transformer assisted line feed circuit with supervision filtering | |||
| 929 | 4539437 | Stored program power control system for improving energy efficiency for telephone sets connected into a local telephone communications system | |||
| 930 | 4538032 | Interface circuit with impedance adaptation means | |||
| 931 | 4536619 | Ringing signal detection circuit | |||
| 932 | 4536614 | Supervision and dial pulse detection circuit for a telephone subscriber line | |||
| 933 | 4535303 | Driver circuit | |||
| 934 | 4533792 | Circuit for switching between ring signal and message waiting signal without bell tap | |||
| 935 | 4532384 | Line feed circuit including negative impedance circuit | |||
| 936 | 4532381 | Active impedance line feed circuit | |||
| 937 | 4528425 | Method of and circuitry for detecting, at a telephone exchange, the lifting of a subscriber's handset in response to ringing current emitted by the exchange | |||
| 938 | 4527157 | Single fault tolerant CCIS data link arrangement | |||
| 939 | 4525602 | Method of and a circuit for energizing a subscriber's circuit in a telephone system | |||
| 940 | 4524246 | SLIC II--common-mode current rejection | |||
| 941 | 4524245 | Ring trip detection system | |||
| 942 | 4523058 | Ringer signal wave shaping circuit | |||
| 943 | 4514596 | Telephone handsets | |||
| 944 | 4514595 | Active impedance line feed circuit | |||
| 945 | 4511763 | Floating dc current source for a subscriber loop circuit | |||
| 946 | 4508937 | Method and circuitry for encoding telephone ringing signals | |||
| 947 | 4504701 | Telephone having circuitry for reducing the audio output of the ringing signal | |||
| 948 | 4503289 | Line circuit with flux compensation and active impedance termination | |||
| 949 | 4500844 | Ringing signal generator employing delta-modulation power amplification techniques | |||
| 950 | 4499532 | Floating battery feed circuit | |||
| 951 | 4496798 | Ringing circuit for telephone subset, designed as an integrated circuit | |||
| 952 | 4495652 | Control arrangement for radio apparatus | |||
| 953 | 4492821 | Subscriber connection circuit | |||
| 954 | 4491700 | Hybrid circuit in a telephone subscriber interface circuit | |||
| 955 | 4491691 | Electronic tone ringer | |||
1984 | |||||
| 956 | 4490580 | Subscriber line circuit comprising a controllable DC/DC converter as a battery feed circuit | |||
| 957 | 4489222 | Telephone line interface | |||
| 958 | 4484032 | Active impedance transformer assisted line feed circuit | |||
| 959 | 4481463 | Current mirror circuit | |||
| 960 | 4480154 | Automatic telephone silencer | |||
| 961 | 4479034 | Arrangement of interactive processors for control of ports | |||
| 962 | 4477697 | Method and circuitry for encoding telephone ringing signals | |||
| 963 | 4476351 | Subscriber loop current regulator | |||
| 964 | 4476350 | Battery feed circuit | |||
| 965 | 4473719 | Switchhook status detector | |||
| 966 | 4472608 | Subscriber line interface circuit | |||
| 967 | 4472602 | Telephone set with transducer/ringer | |||
| 968 | 4471169 | Arrangement of interactive telephone switching processors and associated port data storage means | |||
| 969 | 4467310 | Telephone subscriber line battery feed resistor arrangements | |||
| 970 | 4467269 | Start-up circuit for negative inductance multiplier | |||
| 971 | 4467144 | Telephone annuciator extender | |||
| 972 | 4465967 | Current supply circuit | |||
| 973 | 4463307 | Negative inductance multiplier circuit including temperature compensation | |||
| 974 | 4459435 | Telephone privacy apparatus | |||
| 975 | 4458112 | Floating subscriber loop interface circuit | |||
| 976 | 4455456 | Digital supervisory circuit for a telephone system | |||
| 977 | 4451773 | Rectifier control system for a DC power plant system | |||
| 978 | 4451703 | All electronic interface for telephony system | |||
| 979 | 4451702 | Arrangement of interactive telephone switching processors for performing timing analyses of port events | |||
| 980 | 4447675 | Ring-trip detector | |||
| 981 | 4447673 | Ring trip apparatus for a line circuit connected to DCO switch | |||
| 982 | 4446339 | Rotary dial decoder | |||
| 983 | 4445006 | Four-wire conversion circuit for a telephone subscriber line | |||
| 984 | 4443669 | Subscriber connection circuit | |||
| 985 | 4443663 | Filtering of port data in a switching system employing interactive processors | |||
| 986 | 4440980 | Overvoltage protection for a line circuit | |||
| 987 | 4436960 | Telephone ringing signal generator | |||
| 988 | 4435803 | Analog subscriber/trunk module with shared ringing source and ring-trip | |||
| 989 | 4433213 | Subscriber's line circuit for telecommunications networks | |||
| 990 | 4431874 | Balanced current multiplier circuit for a subscriber loop interface circuit | |||
| 991 | 4431869 | Telephone line feed | |||
| 992 | 4431868 | Solid state telephone line interface circuit with ringing capability | |||
| 993 | 4429186 | Floating battery feed circuit for telephone subscriber line interface | |||
| 994 | 4429185 | Voltage detector circuit | |||
| 995 | 4426587 | Power supply distribution system | |||
1983 | |||||
| 996 | 4421953 | Telephone tactile alert system | |||
| 997 | 4419542 | Battery feed circuit | |||
| 998 | 4415961 | Telephone ringing signal generator | |||
| 999 | 4415775 | Arrangement for exchanging signals between separated circuits | |||
| 1000 | 4414435 | Interface circuit with flux cancelling transformer circuit | |||
| 1001 | 4414434 | Electronic subscriber line interface circuit having means to equalize current through the output differential amplifier | |||
| 1002 | 4410766 | Power saving line circuit | |||
| 1003 | 4409439 | Controllable telephone call annunciator | |||
| 1004 | 4409438 | Ringing control circuit in a telephone switching system | |||
| 1005 | 4406929 | Hook status detector for a subscriber loop interface circuit | |||
| 1006 | 4406927 | Electronic tone ringer | |||
| 1007 | 4406004 | Ring scheduling apparatus for a digital multiplexed telecommunication system | |||
| 1008 | 4403115 | Station identification circuit arrangement | |||
| 1009 | 4402039 | Telephone line circuit | |||
| 1010 | 4398143 | Remote supply circuit for analog two-wire connection | |||
| 1011 | 4396805 | Ring trip detector for a subscriber line interface circuit | |||
| 1012 | 4388500 | Electronic hybrid | |||
| 1013 | 4387273 | Subscriber line interface circuit with impedance synthesizer | |||
| 1014 | 4385385 | Circuit for monitoring a digital signal generator | |||
| 1015 | 4385336 | Current supplying circuit with shorted-to-ground fault detecting function | |||
| 1016 | 4384171 | Automatic telephone silencer | |||
| 1017 | 4380688 | Telephone ringing range extender | |||
| 1018 | 4379210 | Ringing detector for use by the deaf | |||
| 1019 | 4375015 | Improved electronic hybrid circuit | |||
| 1020 | 4374307 | Ringer system for a telephone | |||
| 1021 | 4374306 | Zero-loss automatic polarization protection device | |||
| 1022 | 4374303 | Power supply control circuit for subscriber carrier telephone system | |||
| 1023 | 4373118 | Battery feed circuit | |||
| 1024 | 4371789 | Power control arrangement | |||
| 1025 | 4370526 | Arrangement for applying a ringing voltage to a subscriber's line | |||
| 1026 | 4367376 | Electronic telephone ringer including anti-bell tap provisions | |||
1982 | |||||
| 1027 | 4365116 | Digital ringing-signal generator | |||
| 1028 | 4362908 | Circuit arrangement for emitting ringing signals in a telephone system | |||
| 1029 | 4361732 | Trunk interface circuit with current compensation | |||
| 1030 | 4359610 | Telephone ringing circuit | |||
| 1031 | 4359609 | Circuit with feedback for controlling the impedance thereof | |||
| 1032 | 4358645 | Loop sensing circuit for use with a subscriber loop interface circuit | |||
| 1033 | 4357495 | Telephone line feed | |||
| 1034 | 4357494 | Impedance canceller circuit | |||
| 1035 | 4356355 | Apparatus for detecting the closure of a subscriber's line during ringing | |||
| 1036 | 4356354 | Electronic subscriber junctor | |||
| 1037 | 4355209 | Programmable line circuit | |||
| 1038 | 4355206 | Ringing control device | |||
| 1039 | 4354062 | Communication system signaling circuit | |||
| 1040 | 4350964 | Impedance generator circuit | |||
| 1041 | 4349703 | Programmable ring signal generator | |||
| 1042 | 4346422 | Power-distribution network for telecommunication system | |||
| 1043 | 4346265 | Annunciator | |||
| 1044 | 4345169 | Zero crossing detector | |||
| 1045 | 4345117 | Telephone line feed circuit | |||
| 1046 | 4343971 | Subscriber drop circuit for controlling drop current with load and maximizing power usage | |||
| 1047 | 4341928 | Ringing signal supply | |||
| 1048 | 4340869 | Amplifier for use in a line circuit | |||
| 1049 | 4340785 | Ringing signal supply | |||
| 1050 | 4331913 | Precision negative impedance circuit with calibration | |||
| 1051 | 4331838 | Telephone ringer isolator circuit arrangement | |||
| 1052 | 4327254 | Ringer circuit for telephone | |||
| 1053 | 4322586 | Transformerless line interface circuit | |||
| 1054 | 4321430 | Subscriber's connecting network comprising a symmetrical power amplifier for feeding a subscriber's line | |||
| 1055 | 4320260 | Circuit arrangement for determining the connection condition of a subscriber line in a telecommunications network | |||
| 1056 | 4320258 | Arrangement for requesting service for called telephone subscribers | |||
| 1057 | 4319093 | Transmission bridge for a subscriber set | |||
| 1058 | 4317963 | Subscriber line interface circuit utilizing impedance synthesizer and shared voltage source for loop current regulation control | |||
| 1059 | 4315207 | Current controlled battery feed circuit | |||
| 1060 | 4315206 | Current supply circuit for telephone exchange | |||
| 1061 | 4315109 | Electronic ring sounder for a speaker telephone | |||
| 1062 | 4315106 | Apparatus for regulating current supplied to a telephone line signal of the type employed in digital telephone systems | |||
| 1063 | 4314106 | Line circuit | |||
| 1064 | 4313034 | Connecting circuit for a telephone line | |||
| 1065 | 4310733 | Arrangement for applying signals to a telephone line | |||
| 1066 | 4310728 | Ringing device for a private automatic branch exchange | |||
| 1067 | 4309748 | DC/DC Stabilized voltage converter unit | |||
| 1068 | 4309664 | Digital energy line sensor | |||
| 1069 | 4309578 | Telephone ringer load simulator | |||
| 1070 | 4309574 | Electronic tone ringer | |||
1981 | |||||
| 1071 | 4306122 | Telephone line circuit | |||
| 1072 | 4306118 | Telephone set ringing current injection device | |||
| 1073 | 4302636 | Subscriber's electronic line equipment comprising a two-wire-four-wire conversion circuit for a telephone exchange | |||
| 1074 | 4301335 | Visual telephone or other annuciator ringing indicator | |||
| 1075 | 4301334 | Telecommunication subscriber line access circuit with ground key and insulation fault indication | |||
| 1076 | 4300023 | Hybrid circuit | |||
| 1077 | 4296337 | Resistance detector with delayed hysteresis | |||
| 1078 | 4292604 | Relaxation oscillator with plural constant current sources | |||
| 1079 | 4292479 | Separation and balance device for telephone exchanges | |||
| 1080 | 4292478 | Interface circuits | |||
| 1081 | 4292473 | Loop supervision circuit | |||
| 1082 | 4289933 | Dial pulse detection | |||
| 1083 | 4287393 | Transmission bridge for a subscriber's circuit | |||
| 1084 | 4287392 | Integrated circuitry for exchanging signals between telephone station and central office | |||
| 1085 | 4284854 | Universal signal generator for generating telephone system high level signals | |||
| 1086 | 4284853 | Telecommunication subscriber line access circuit with ground key indication and a device for call signal generation | |||
| 1087 | 4283604 | Current source circuits with common mode noise rejection | |||
| 1088 | 4282410 | Ringing signal generator | |||
| 1089 | 4282407 | Telephone loop resistance detector | |||
| 1090 | 4276448 | Electronic tone ringer | |||
| 1091 | 4276447 | Signal processing apparatus for subscriber circuits | |||
| 1092 | 4275277 | Subscriber line interface circuit for a telephone line | |||
| 1093 | 4273964 | Ring and tone plant | |||
| 1094 | 4272656 | Quasi-resistive battery feed for telephone circuits | |||
| 1095 | 4272650 | Power supply system | |||
| 1096 | 4270028 | Digitally activated ringing circuit for generation of AC voltages | |||
| 1097 | 4268718 | Housing acoustical amplifier | |||
| 1098 | 4267408 | Arrangement for applying a signal to a transmission line | |||
| 1099 | 4264786 | A.C. Signal current transmission trunk circuit for telephone exchange systems | |||
| 1100 | 4262172 | Ring-trip detector | |||
| 1101 | 4254305 | Current limited subscriber line feed circuit | |||
| 1102 | 4251694 | Tone-ringing circuits and methods for telephone sets | |||
| 1103 | 4245294 | Power supply providing constant power output | |||
| 1104 | 4243842 | Telephone line circuit | |||
1980 | |||||
| 1105 | 4241239 | Fluxbucking line transformer with electronic equivalent line terminating impedance | |||
| 1106 | 4239941 | Ringing signal generator | |||
| 1107 | 4239935 | Ringing generator | |||
| 1108 | 4238644 | Supply circuit for a subscriber's line circuit | |||
| 1109 | 4234763 | Feeding bridge with d.c.-compensation for both directions of the feed current | |||
| 1110 | 4234762 | Ring trip detector circuit | |||
| 1111 | 4230910 | Signalling and channel loop test circuits for station carrier telephone system | |||
| 1112 | 4229665 | Programmable power supply system | |||
| 1113 | 4220826 | Ringing generator | |||
| 1114 | 4217503 | Current limiter | |||
| 1115 | 4214131 | Electronic audio signalling device for telephones | |||
| 1116 | 4213016 | Arrangement for measuring the line condition of a subscriber's line circuit by means of a measuring resistor | |||
| 1117 | 4211896 | Subscriber's circuit with a symmetrical amplifier | |||
| 1118 | 4205204 | Telephone loop extending apparatus | |||
| 1119 | 4203012 | Hybrid circuit using current mirror circuits | |||
| 1120 | 4203009 | Unbalanced/balanced converter circuits | |||
| 1121 | 4201897 | Ringing voltage transfer circuit | |||
| 1122 | 4200435 | Determination of glycosylated hemoglobin in blood | |||
| 1123 | 4199664 | Telephone line circuit | |||
| 1124 | 4197432 | Telephone subscriber's loop power control circuit | |||
| 1125 | 4197431 | Subscriber loop feed apparatus | |||
| 1126 | 4194091 | Line feed circuit | |||
| 1127 | 4192975 | Supply-arrangement for a line circuit | |||
| 1128 | 4192007 | Programmable ringing generator | |||
| 1129 | 4191859 | Loop, dial pulse and ring trip detection circuit with capacitive shunt network | |||
| 1130 | 4189764 | Current controlled inverter | |||
| 1131 | 4189626 | Electronic tone ringer for telephone sets | |||
1979 | |||||
| 1132 | 4178485 | Transformerless telephone line circuit | |||
| 1133 | 4176255 | Adjustable impedance battery feed circuit | |||
| 1134 | 4174467 | Ringing signal generator for use in a subscriber's line circuit | |||
| 1135 | 4167654 | Telephone line feeding circuit including a protective device | |||
| 1136 | 4166930 | Transient free ring relay circuit for arbitrary time switching | |||
| 1137 | 4166928 | Loop, dial pulse and ring trip detection circuit | |||
| 1138 | 4164713 | Dual mode telephone subscriber loop current detector | |||
| 1139 | 4163873 | Telephone solid state ringer | |||
| 1140 | 4158170 | Line current detector | |||
| 1141 | 4157459 | Electronic audio signalling device for telephones | |||
| 1142 | 4156150 | Circuit for regulating a DC voltage on which a large AC voltage is superimposed | |||
| 1143 | 4154989 | Call-signal receiver for station of telecommunication system | |||
| 1144 | 4152670 | Signal generator, especially for ringing current in telecommunication system | |||
| 1145 | 4150260 | Subscriber's circuit for four-wire-system local switch | |||
| 1146 | 4146754 | Telephone signalling method and apparatus | |||
| 1147 | 4145577 | Ringing control apparatus | |||
| 1148 | 4145572 | Power supply control circuit for subscriber carrier telephone system | |||
| 1149 | 4144408 | Telephone ringing extender | |||
| 1150 | 4140884 | Electronic tone ringer | |||
| 1151 | 4140882 | Methods and apparatus for special status indication in telephone systems | |||
| 1152 | 4139740 | Flash-wink generating circuit | |||
| 1153 | 4135062 | Electric network for use in a subscriber's loop | |||
| 1154 | 4132864 | Digital measurement of the DC value in an AC signal adapted to telephone off-hook detection | |||
1978 | |||||
| 1155 | 4131770 | Common bell ringing apparatus for multiple button key telephone set | |||
| 1156 | 4130735 | Loop extender | |||
| 1157 | 4127747 | Voltage boost circuit for telephone systems | |||
| 1158 | 4122312 | Loop extender | |||
| 1159 | 4115660 | Telephone line interfacing circuit with directional transfer of ringing current and off-hook indications | |||
| 1160 | 4113990 | Signal sending control system | |||
| 1161 | 4110636 | Feeding bridge | |||
| 1162 | 4110569 | Method and apparatus for monitoring the on/off-hook status of a telephone set | |||
| 1163 | 4107495 | Electronic tone ringer | |||
| 1164 | 4107476 | Electronic tone ringer control circuit for a telephone set | |||
| 1165 | 4104488 | Subscriber line circuit | |||
| 1166 | 4103112 | Telephone line circuit with differential loop current sensing and compensation | |||
| 1167 | 4101871 | Touch-tone encoder unit for mobile radio transmitter | |||
| 1168 | 4099032 | Loop current detector | |||
| 1169 | 4096363 | Transmission network including flux compensation | |||
| 1170 | 4088843 | Electronic current feed circuit | |||
| 1171 | 4087647 | Circuit for supplying direct current to telephone station sets | |||
| 1172 | 4087646 | Dual mode telephone subscriber loop current detector | |||
| 1173 | 4086447 | Electronic hybrid circuit for connecting a two-wire line to switching system | |||
| 1174 | 4081617 | Electronic ringing circuit for telephone systems | |||
| 1175 | 4081609 | Synchronous ring detector for station carrier telephone systems | |||
| 1176 | 4081130 | Filter-type pulse detection means | |||
| 1177 | 4079208 | Telecommunications transmission and signalling circuits | |||
| 1178 | 4076968 | Telephone ringer intensity control responsive to ambient noise | |||
| 1179 | 4071709 | Line conditioning and transfer circuit | |||
1977 | |||||
| 1180 | 4065755 | Touch-Tone encoder unit for mobile radio transmitter | |||
| 1181 | 4064449 | Direct current compensation circuit for transformers | |||
| 1182 | 4064377 | Electronic hybrid and hybrid repeater | |||
| 1183 | 4056693 | Voltage and current controlled converter for telephone ringing | |||
| 1184 | 4056691 | Telephone subscriber line circuit | |||
| 1185 | 4056689 | Telephone subscriber line circuit | |||
| 1186 | 4056688 | Telephone range extender with gain | |||
| 1187 | 4056687 | Decoupling control arrangement for auxiliary circuits coupled to telephone lines | |||
| 1188 | 4054941 | Range extender with gain | |||
| 1189 | 4053722 | Solid state two-wire/four-wire converter with common battery | |||
| 1190 | 4053717 | Cordless telephone | |||
| 1191 | 4049928 | Self-adjusting voice frequency repeater | |||
| 1192 | 4048552 | Digitally regulated inverter | |||
| 1193 | 4046970 | Ringing detector for telephone circuits | |||
| 1194 | 4046969 | Dial pulse repeating line circuit using miniature line transformer | |||
| 1195 | 4046968 | Integrable line circuit for use with miniature line transformer | |||
| 1196 | 4046967 | Line circuit using miniature line transformer | |||
| 1197 | 4042786 | Telephone ringer circuit | |||
| 1198 | 4041252 | Transformerless two-wire/four-wire hybrid with DC sourcing capability | |||
| 1199 | 4039766 | Electric two-to-four wire conversion circuit for use in telephone systems | |||
| 1200 | 4039760 | Cordless telephone system | |||
| 1201 | 4037117 | Peak shut-off electronic switch | |||
| 1202 | 4035586 | Current supply system for terminal devices | |||
| 1203 | 4034166 | Transmission networks for telephone system | |||
| 1204 | 4031332 | Telephone ringer insolator | |||
| 1205 | 4027235 | Direct current compensation circuit with current threshold detection | |||
| 1206 | 4025729 | Telephone ringing control circuits | |||
| 1207 | 4025727 | Balanced tone application system | |||
| 1208 | 4024351 | Telephone line battery boost circuit | |||
| 1209 | 4022980 | Ring trip detector | |||
| 1210 | 4021617 | Telephone ringer isolator | |||
| 1211 | 4015091 | Telephone ringing generators | |||
| 1212 | 4012702 | Chime generating circuit | |||
| 1213 | 4011410 | Communication system interface circuits | |||
| 1214 | 4010329 | Crescendo control of signalling devices | |||
| 1215 | 4007335 | Telephone line battery feed circuit | |||
| 1216 | 4006316 | Code-controlled detection and function actuating system | |||
| 1217 | 4004109 | Hybrid circuit | |||
| 1218 | 4004104 | System for feeding in continuous current to a telephone line | |||
| 1219 | 4002853 | Visual ring indicator | |||
| 1220 | 4002838 | Telephone ringing control circuits | |||
| 1221 | 4001708 | Code-controlled ringer attachment for telephones including a-peak-to-peak gain controlled amplifier | |||
| 1222 | 4001516 | Apparatus for feeding and controlling ringing currents in telecommunication systems | |||
| 1223 | 4001515 | Interfacing unit for telephone networks | |||
1976 | |||||
| 1224 | 3993880 | Resistive battery feed for line circuits | |||
| 1225 | 3992591 | Telephone line battery boost circuit | |||
| 1226 | 3985976 | Audio frequency signalling systems for telephone systems | |||
| 1227 | 3978391 | Direct current stabilizing device | |||
| 1228 | 3970805 | Active hybrid circuit | |||
| 1229 | 3970801 | Dialing apparatus for a portable radio telephone | |||
| 1230 | 3965447 | Synthetic reactor circuit | |||
| 1231 | 3965307 | Electronic tone ringer | |||
| 1232 | 3959718 | Direct current supply source | |||
| 1233 | 3955052 | Subscriber unit particularly useful for time-division-multiplex system | |||
| 1234 | 3953683 | Interrupter for telephone systems | |||
| 1235 | 3946164 | Precise tone signal generator | |||
| 1236 | 3943432 | Electronic feeding bridge | |||
| 1237 | 3941941 | Relayless switching circuit for application of ringing signals | |||
| 1238 | 3941939 | Electronic ring trip circuit | |||
| 1239 | 3939311 | Muting circuit for subscribers telephone | |||
| 1240 | 3936617 | Code-controlled ringer attachment for telephones | |||
| © 2017, ПАТ-Инфо, В.И. Карнышев
Дата формирования списка: 03.04.2017 | |||||