СПИСОК патентов США - подгруппа МПК16 H04M1/738
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| № п/п | Номер патента | Название патента | |||
2016 | |||||
| 1 | 9491304 | VOIP analog telephone system | |||
| 2 | 9420110 | Telephony terminal | |||
2015 | |||||
| 3 | 9148909 | Mobile terminal | |||
| 4 | 9125227 | Communications device for a wireless and land-line network | |||
| 5 | 9100499 | Communication apparatus and method with off-hook detection and power supply control | |||
| 6 | 9088648 | System and method for effecting prearranged notification following placing of a call using a predetermined number | |||
| 7 | 9059779 | Serial digital interface between an RF transceiver and a baseband chip | |||
| 8 | 9058169 | Method and system for waking up remote devices | |||
2010 | |||||
| 9 | 7672450 | Network interface device enclosure | |||
2007 | |||||
| 10 | 7200223 | Electronic circuit to reduce noise in digital subscriber loop and communications over unshielded twisted pair metallic conductors | |||
2006 | |||||
| 11 | 7031462 | Electronic inductor with transmit signal telephone line driver | |||
| 12 | 7031454 | Method and apparatus for interfacing telephone apparatus to a digital, analog or hybrid telephone switching system | |||
2005 | |||||
| 13 | 6950514 | Voltage reference filter for subscriber line interface circuit | |||
| 14 | 6940968 | Telephone terminal apparatus and method | |||
| 15 | 6937719 | Multiplexing and demultiplexing of narrowband and broadband services in a transmission connection | |||
| 16 | 6930751 | Method and apparatus for reducing false hook detection | |||
| 17 | 6928159 | Telephone for connection to a public telephone network | |||
| 18 | 6922470 | Hybrid DC-feed controller for a subscriber line interface circuit | |||
| 19 | 6914963 | Determining the composition of subscriber loops from frequency domain measurements | |||
| 20 | 6904145 | ADSL front-end in a low voltage process that accommodates large line voltages | |||
| 21 | 6904144 | Impedance compensation in interfacing a modem to a telephone line | |||
| 22 | 6895089 | Pots splitter with line impedance matching | |||
| 23 | 6888938 | Dynamically adjustable digital gyrator having extendable feedback for stable DC load line | |||
| 24 | 6882716 | Local control of call features in a telephone system | |||
| 25 | 6876742 | High-voltage protection circuitry in a data access arrangement | |||
| 26 | 6873703 | Precision, low-power current-sense transmission channel for subscriber line interface circuit, programmable with single ended impedances and capable of exhibiting a voltage sense response | |||
| 27 | 6870928 | Line interface, apparatus and method for coupling transceiver and transmission line | |||
| 28 | 6868081 | Method and apparatus for simultaneous multiline phone and data services over a single access facility | |||
| 29 | 6853724 | Cascade low-pass filter to improve xDSL band attenuation for POTS splitter | |||
| 30 | 6845157 | Linear polarity guard and method for DSL-ready pots devices | |||
| 31 | 6845149 | Method for frequency and loop length grouping for cross-talk reduction in a plurality of DSL channels | |||
| 32 | 6842520 | Telephone | |||
2004 | |||||
| 33 | 6819761 | Programmable constant current "off hook" circuit | |||
| 34 | 6792105 | Current-mode differential active hybrid circuit | |||
| 35 | 6792104 | Transformer-coupled matching impedance | |||
| 36 | 6788953 | Wireless local loop communication system using SLIC module | |||
| 37 | 6782098 | Protection circuit/method for subscriber telephone interface circuit | |||
| 38 | 6781957 | Application module interface for a control channel in a private branch exchange (PBX) environment | |||
| 39 | 6757386 | Apparatus, system, and method for efficient reduction of electromagnetic interference in telecommunications equipment | |||
| 40 | 6757382 | Quasi ground fault interruption signal-based activation of emergency pots by-pass paths for line-powered digital subscriber loop | |||
| 41 | 6757381 | Design of telephone line interface circuits using a two chip opto-coupler with LEDs integrated onto silicon chips | |||
| 42 | 6757380 | Impedance blocking filter circuit for digital subscriber line communication systems | |||
| 43 | 6748077 | Station interface and protector with built in redundancy | |||
| 44 | 6744883 | Filter system and method to suppress interference imposed upon a frequency-division multiplexed channel | |||
| 45 | 6735305 | Detection of low tip/ring currents in a line powered DAA | |||
| 46 | 6731752 | Method and circuit for echo-cancellation in two-way communications | |||
| 47 | 6731751 | Apparatus for cordless computer telephony | |||
| 48 | 6731748 | Audio interface for satellite user terminals | |||
| 49 | 6724890 | Adaptive transmission line impedance matching device and method | |||
| 50 | 6714647 | Network interface unit with subscriber line daughter boards | |||
| 51 | 6714645 | Telephone line interface circuit without hookswitch relay | |||
| 52 | 6704416 | Hook switch status glitch filter | |||
| 53 | 6697485 | Data signal attenuator and systems and methods for using same | |||
| 54 | 6694016 | Odd-order low-pass POTS device microfilter | |||
| 55 | 6694014 | Constant impedance digital line interface circuit | |||
2003 | |||||
| 56 | 6665403 | Digital gyrator | |||
| 57 | 6665400 | Low-voltage transistor circuit for suppressing high-voltage surges in a telephone line interface circuit | |||
| 58 | 6661893 | Telephone loop monitoring and isolation system | |||
| 59 | 6650841 | Optical subscriber line terminal unit and a state transition control method | |||
| 60 | 6647115 | Method and apparatus for an improved analog echo canceller | |||
| 61 | 6647114 | Telephone line interface circuit with virtual impedance | |||
| 62 | 6643270 | Method of compensating for systemic impairments in a telecommunications network | |||
| 63 | 6628782 | Ring voltage termination by means of a spare fuse | |||
| 64 | 6625278 | Impedance matching with sigma delta filter | |||
| 65 | 6621904 | Pre-charging line modem capacitors to reduce DC setup time | |||
| 66 | 6618474 | Method and apparatus for providing to a customer a promotional message between ringing signals or after a call waiting tone | |||
| 67 | 6608899 | Telephone circuit surge protection module | |||
| 68 | 6606231 | Integrated telephony subscriber line protection and filter device | |||
| 69 | 6553118 | Method and apparatus for calculating DC offset in a digital gyrator | |||
| 70 | 6507654 | Line interface battery feed arrangements with PTC resistors | |||
| 71 | 6504927 | Mechanism for measuring resistance of telephone subscriber line and generating measurement as pulse width of periodic waveform | |||
2002 | |||||
| 72 | 6480604 | Balanced spectrum limiter for telephone and communication systems and protection module incorporating the same | |||
| 73 | 6473507 | Apparatus and method for isolating transients associated with a digital subscriber line | |||
| 74 | 6470083 | Telecommunications off-hook and intrusion detection method and apparatus | |||
| 75 | 6442255 | Automatic subscriber callback system | |||
| 76 | 6438225 | Method and system for detecting and controlling severe echo | |||
| 77 | 6434220 | Long-distance transmission system and device | |||
| 78 | 6418222 | High current protection circuit for telephone interface | |||
| 79 | 6418220 | Extended feedback circuit employing capacitive coupling and sampled data filters | |||
| 80 | 6411680 | Telephonic apparatus and input device for telephonic apparatus | |||
| 81 | 6396922 | Telecommunications terminal card | |||
| 82 | 6393110 | Methods and apparatus for terminating a line and supporting the asymmetric digital subscriber line protocol | |||
| 83 | 6384946 | Electrical isolation between IR receiver and further electronic circuits | |||
| 84 | 6351531 | Method and system for controlling echo cancellation using zero echo path, ringing, and off-hook detection | |||
| 85 | 6343126 | Method and apparatus for interfacing analog telephone apparatus to a digital, analog or hybrid telephone switching system | |||
| 86 | 6343069 | Apparatus and method for automatic and adaptive adjustment of build-out capacitance to balance a hybrid | |||
| 87 | 6342999 | Current surge absorbing wire winding box | |||
2001 | |||||
| 88 | 6327301 | Detection and adaptation to digital network impairments by PCM modems | |||
| 89 | 6314180 | System and method for providing a frequency dependent synthetic termination | |||
| 90 | 6301337 | Combined handset and POTS filter | |||
| 91 | 6298134 | System for protecting telecommunications equipment from transient voltages | |||
| 92 | 6285754 | Odd-order low-pass pots device microfilter | |||
| 93 | 6282001 | Data access arrangement having improved transmit-receive separation | |||
| 94 | 6275582 | Differential line bridge for scaleable near-end speech cancellation for tip and ring tone signal detectors | |||
| 95 | 6275581 | Extended feedback circuit employing capacitive coupling and sampled data filters | |||
| 96 | 6263076 | Arrangement in a subscriber line interface circuit | |||
| 97 | 6259788 | Technique for balancing loads in a communication network | |||
| 98 | 6259589 | Protection apparatus applied to a telephone line | |||
| 99 | 6240177 | Communication device comprising an off-hook detection circuit | |||
| 100 | 6233334 | Telecommunication circuit and a telecommunication device | |||
| 101 | 6229890 | Network interface device with automatic connector closure | |||
| 102 | 6205201 | Telephone line testing device | |||
| 103 | 6198817 | Communication interface having combined shaping of receive response and synthesized matching terminating impedances for different frequency bands and a design method therefor | |||
| 104 | 6192125 | Optical coupling circuit for a data access arrangement (DAA) | |||
| 105 | 6186834 | Enhanced communication connector assembly with crosstalk compensation | |||
| 106 | 6185296 | Ring trip circuit for stopping call signal at different timing from zero-crossing point of call signal | |||
| 107 | 6185293 | Signal matching apparatus for exchanging signals between an analog switching system and a digital switching system | |||
| 108 | 6185083 | Protected telecommunication test adapter module | |||
| 109 | 6181792 | Communication interface having synthesized matching impedances for different frequency bands and a design method therefor | |||
| 110 | 6178162 | Method and apparatus for inhibiting echo in a channel of a communication system | |||
| 111 | 6176742 | Capacitive crosstalk compensation arrangement for communication connectors | |||
2000 | |||||
| 112 | 6163447 | Telephone equipment protection circuit | |||
| 113 | 6157712 | Speech immunity enhancement in linear prediction based DTMF detector | |||
| 114 | 6151392 | Telecommunications protector panel connector assembly | |||
| 115 | 6144735 | Filters for a digital subscriber line system for voice communication over a telephone line | |||
| 116 | 6137879 | Computer telephony headset amplifier | |||
| 117 | 6134321 | Modem loop current detect system to detect an off-hook condition in an extension telephone | |||
| 118 | 6128368 | Apparatus for monitoring telecommunication transmission | |||
| 119 | 6115466 | Subscriber line system having a dual-mode filter for voice communications over a telephone line | |||
| 120 | 6111936 | Method and apparatus for automatically detecting and measuring distortion in a DSL system | |||
| 121 | 6091338 | System and method for safety protection of XDSL circuitry | |||
| 122 | 6088446 | Protection circuit for use with a telephone appliance and methods of use | |||
| 123 | 6084958 | Determining the manner in which the wires connecting to a base set of a telephone system are used for transmission and reception of electrical signals representing a communication | |||
| 124 | 6081593 | Method and apparatus for transmitting white noise for echo cancellation in a voice mail system | |||
| 125 | 6078662 | Radio frequency interference filter | |||
| 126 | 6060972 | Method and means for replacing an electrically conducting cable by another electrically conducting cable | |||
| 127 | 6055435 | Wireless telephone connection surge suppressor | |||
| 128 | 6055310 | Phase reversal tone detector using DSP | |||
| 129 | 6028919 | Passive distributed filter system and method including caller ID | |||
| 130 | 6011831 | Network interface device having cavities for housing test circuitry | |||
1999 | |||||
| 131 | 6005933 | Method for communication with no power feed and exchange for realizing the method | |||
| 132 | 6002684 | Method and system for achieving faster asymmetric data transmission through the public switched telephone network | |||
| 133 | 5999619 | Synthetic termination | |||
| 134 | 5999612 | Integrated telephony and data services over cable networks | |||
| 135 | 5995619 | Telephony device with compensation for line losses | |||
| 136 | 5991398 | Telephone terminal apparatus and method | |||
| 137 | 5982878 | Combined loop current sink, battery detector, and ringing detector circuit | |||
| 138 | 5975924 | Grounding mechanism with integrated strain relief | |||
| 139 | 5974139 | Line isolation device for asymmetrical digital subscriber line | |||
| 140 | 5963588 | Apparatus for modulating/demodulating signals | |||
| 141 | 5959815 | Method and apparatus for detecting potentially damaging electrical fields | |||
| 142 | 5956385 | Test set interface for automatically detecting line type | |||
| 143 | 5953194 | Arrangement for protecting telecommunications equipment from voltage transients | |||
| 144 | 5946394 | Isolation amplifier with hook switch control | |||
| 145 | 5943419 | Subscriber circuit with built-in polarity switching circuit | |||
| 146 | 5912964 | Adaptive telephone handset interface | |||
| 147 | 5912513 | Method and apparatus for reducing power dissipation in DC termination circuit | |||
| 148 | 5893034 | Cordless parent/slave telephone set with improved sidetone handling | |||
| 149 | 5889854 | Technique for compensating for signal attenuation on a telephone line | |||
| 150 | 5888085 | Network interface device with switchable contacts | |||
| 151 | 5883953 | Telephone and data communications line protection module and grounding spring clip | |||
| 152 | 5878132 | High-frequency noise elimination for use in telephone systems | |||
| 153 | 5870465 | Telephony adapter system for providing a user with a virtual presence to an office | |||
| 154 | 5867083 | Protective device for surge current protection of associated equipment in communications systems | |||
| 155 | 5857010 | Power-failure resistant communication system | |||
1998 | |||||
| 156 | 5822426 | Balanced hybrid circuit | |||
| 157 | 5818923 | System and method for supressing pulse dialing feedback occurring particularly with auxiliary acoustic ringers in socket telephone systems | |||
| 158 | 5815918 | Method for replacing an electrically conducting cable by another electrically conducting cable | |||
| 159 | 5809134 | Telephone interface circuit with impedance termination during call pauses | |||
| 160 | 5809109 | Integrated ring sensor with fault detection | |||
| 161 | 5802170 | Customer bridge module | |||
| 162 | 5796817 | Hybrid circuit for an electric operating and scanning interface, applicable to electronic recorders of electromechanical telephone stations | |||
| 163 | 5783999 | Audio warning device for use with a line current protection circuit in a PCMCIA-architecture modem card | |||
| 164 | 5777836 | Line current protection circuit and method for use with a PCMCIA-architecture modem card | |||
| 165 | 5771286 | Speech amplifier associated with an LED | |||
| 166 | 5751803 | Telephone line coupler | |||
| 167 | 5748719 | Relay circuit for telephone interface | |||
| 168 | 5742676 | Circuit for telephone set comprising a light-emitting diode power supply | |||
| 169 | 5742417 | Data access arrangement having improved transmit-receive separation | |||
| 170 | 5719917 | Circuit for activating back-up lines | |||
| 171 | 5717558 | Electrostatic discharge protection for an electrical device | |||
| 172 | 5710811 | Speech circuit for subscriber telephone apparatus | |||
1997 | |||||
| 173 | 5696660 | Line current protection circuit for use with a PCMCIA-architecture modem card | |||
| 174 | 5694460 | Circuit and method for reducing common mode interference in telephone instruments | |||
| 175 | 5692041 | Telephone subscriber circuit with galvanic isolation | |||
| 176 | 5661624 | Foldback current limiting of a telephone line switch | |||
| 177 | 5659602 | Telephone apparatus for caller ID | |||
| 178 | 5642416 | AM broadcast band interference filter for line-powered telephone | |||
| 179 | 5640451 | Power cross detection using loop current and voltage | |||
| 180 | 5638440 | Protection circuit for telephone systems | |||
| 181 | 5637011 | Wire termination device | |||
| 182 | 5633925 | Low loss telephone circuit | |||
| 183 | 5627890 | Telephone line interface circuit | |||
| 184 | 5608795 | Telephone line interface circuit | |||
| 185 | 5606592 | Method and apparatus for analyzing resistive faults on telephones cables | |||
| 186 | 5602914 | Device for limiting the working voltage for mechanical switches in telephony | |||
| 187 | 5598467 | Signal interface circuit with selectable signal interface parameters | |||
| 188 | 5596470 | Fault current protection circuit for an auxiliary device in a digital telephone system | |||
1996 | |||||
| 189 | 5590185 | Multiple phone line adaptor | |||
| 190 | 5579144 | Data access arrangement having improved transmit-receive separation | |||
| 191 | 5555293 | Optically-coupled data access arrangement and transhybrid | |||
| 192 | 5553136 | Modular device for telephone network interface apparatus | |||
| 193 | 5539801 | Removable telephone line protection module for an electronic device | |||
| 194 | 5537471 | Weatherproof telephone station protectors | |||
| 195 | 5532898 | Line current protection circuit for use with a PCMCIA-architecture modem card | |||
| 196 | 5528683 | Method and circuit for implementing an impedance, in particular for DC telephonic applications | |||
| 197 | 5513059 | Arrangement for protecting telecommunications equipment from voltage transients | |||
| 198 | 5502760 | Telephone-line dedicating apparatus | |||
| 199 | 5500895 | Telephone isolation device | |||
| 200 | 5497417 | Switching device for transmitting telecommunication signals | |||
| 201 | 5483577 | Single chip telephone answering machine, telephone, speakerphone, and ADSI controller | |||
1995 | |||||
| 202 | 5473685 | Telecommunications end station with electrically controlled terminating impedance | |||
| 203 | 5465298 | Solid state isolation device using opto-isolators | |||
| 204 | 5461670 | Telephone subscriber system incorporating a drive interface for a telephone line switch at a different reference potential | |||
| 205 | 5459787 | Circuit for the implementation of an impedance for a telephone speech circuit | |||
| 206 | 5459783 | Acoustic feedback suppression device particulary for auxiliary ringers in plug-in telephone systems | |||
| 207 | 5448636 | Device for limiting the working voltage mechanical switches in telephony | |||
| 208 | 5416663 | Arrangement for protecting telecommunications equipment from voltage transients | |||
| 209 | 5408525 | Diverter interface between two telecommunication lines and a station set | |||
| 210 | 5402465 | Telephone trouble isolator | |||
| 211 | 5396549 | Terminal station for telecommunication by wire | |||
| 212 | 5390231 | Protection and recovery of telephone line interface circuits | |||
| 213 | 5384842 | Programmable telephone | |||
1994 | |||||
| 214 | 5359657 | Telephone line overvoltage protection apparatus | |||
| 215 | 5357568 | Telephone line overvoltage protection method and apparatus | |||
| 216 | 5347565 | Order wire device having function for reducing noise in communication system having a plurality of order wire devices | |||
| 217 | 5315651 | Active surge rejection circuit | |||
1993 | |||||
| 218 | 5271059 | Method and configuration for forming a line termination of a telephone line | |||
| 219 | 5258713 | Impedance generator for a telephone line interface circuit | |||
| 220 | 5222131 | Telephone protector including removable fuse holder | |||
| 221 | 5208718 | Protection circuit | |||
1992 | |||||
| 222 | 5172412 | Subscriber circuit capable of suppressing in-phase induced noise | |||
| 223 | 5105461 | Telephone line interface circuit | |||
1991 | |||||
| 224 | 5073924 | Telephone line noise filter apparatus | |||
| 225 | 5048073 | Telephone line switching interface unit | |||
| 226 | 5038375 | Circuit arrangement for preventing gain from responding to frequency variation despite the presence of an isolation transformer | |||
| 227 | 4996710 | Side-tone adjusting system and method for key telephone system establishing a plurel kinds of speaking paths | |||
| 228 | 4994759 | Current equalizing circuit | |||
| 229 | 4993060 | Portable device for use by a news reporter | |||
1990 | |||||
| 230 | 4971581 | Connector guard for a telephone line overvoltage protection device | |||
| 231 | 4961219 | Circuit for synthesizing an impedance across the tip and ring leads of a telephone line circuit | |||
| 232 | 4947426 | Telephone protection circuit | |||
| 233 | 4935957 | Key telephone system | |||
| 234 | 4926473 | Longitudinal balance system | |||
| 235 | 4918725 | Terminal impedance setting circuit for a two-wire to four-wire converting circuit | |||
| 236 | 4896352 | Telephone set circuit including an overvoltage protection | |||
| 237 | 4894863 | Method for gain control in telephone sets having an electronic speech circuit, and apparatus for performing the method | |||
| 238 | 4893337 | Circuit arrangement for a digital telephone station | |||
| 239 | 4893331 | System allowing selective connection of various types of external apparatuses to telephone set | |||
1989 | |||||
| 240 | 4876713 | Signal circuit protector device for consumer use | |||
| 241 | 4856058 | Office line interface circuits | |||
| 242 | 4817204 | Optical communication apparatus and method for telephone supervisory and audio signals | |||
1988 | |||||
| 243 | 4788717 | Telephone line interface option module | |||
| 244 | 4757528 | Thermally coupled information transmission across electrical isolation boundaries | |||
| 245 | 4750203 | Subscriber telephone set with amplified loudspeaker reception with reduction of gain in the case of an insufficient power supply | |||
| 246 | 4742540 | Circuit for switching between balanced networks | |||
| 247 | 4727571 | Circuit for surge voltage protection in electronic telephone stations | |||
| 248 | 4723278 | Voice circuit of telephone | |||
| 249 | 4723276 | Two-module telephone terminal | |||
1987 | |||||
| 250 | 4677667 | Subscriber line circuit having improved AC impedance matching | |||
| 251 | 4634814 | Surge protected electronic switch for telephone voiceband circuits | |||
1986 | |||||
| 252 | 4607142 | Transformer flux compensation circuit | |||
| 253 | 4571460 | Active impedance line feed circuit with improved ground fault protection | |||
1985 | |||||
| 254 | 4560834 | Current limiter circuit for battery feed in a telephone circuit | |||
| 255 | 4558183 | Opto-coupler interfacing circuit | |||
| 256 | 4549129 | Regulator circuit | |||
| 257 | 4536616 | Microphone or mouthpiece signal suppression circuit | |||
| 258 | 4515996 | Telephone circuit | |||
| 259 | 4513178 | Signal processing arrangement | |||
| 260 | 4502018 | Gain regulation circuit for an amplifier circuit | |||
| 261 | 4495382 | Telephone regulator circuitry | |||
1984 | |||||
| 262 | 4465903 | Electronic telephone interface circuit | |||
| 263 | 4453038 | Circuit arrangement for producing control means from line current | |||
| 264 | 4453037 | Loop length compensation circuit | |||
| 265 | 4449157 | Surge protection for signal transmission systems | |||
| 266 | 4442325 | Switchable incremental attenuation for telephone line interface | |||
| 267 | 4439637 | Low loop current switch latch circuit | |||
1983 | |||||
| 268 | 4400589 | Subscriber station network | |||
| 269 | 4400588 | Electronic voice network for a telephone subscriber's substation | |||
| 270 | 4394542 | Telephone transmission circuit | |||
| 271 | 4375015 | Improved electronic hybrid circuit | |||
| 272 | 4369337 | Central office interface circuit | |||
1982 | |||||
| 273 | 4357494 | Impedance canceller circuit | |||
| 274 | 4350964 | Impedance generator circuit | |||
| 275 | 4315107 | Telephone range extender with gain | |||
1981 | |||||
| 276 | 4303805 | Subscriber station network | |||
| 277 | 4298775 | Microprocessor controlled telephone set | |||
| 278 | 4283604 | Current source circuits with common mode noise rejection | |||
| 279 | 4268723 | Circuits and methods for initializing the loop current of a telephone set | |||
| 280 | 4264787 | Hazardous voltage protection circuit | |||
| 281 | 4254442 | Circuit for the protection of telephone lines | |||
1980 | |||||
| 282 | 4228323 | Variable loop length compensated barrier circuit | |||
| 283 | 4214130 | Signal coupler | |||
| 284 | 4213012 | Discriminating means for telephone circuits | |||
| 285 | 4203006 | Direct access coupler | |||
1979 | |||||
| 286 | 4178484 | Long line telephone system with an amplifying substation | |||
| 287 | 4176255 | Adjustable impedance battery feed circuit | |||
| 288 | 4169215 | Signal limiting circuit | |||
| 289 | 4152549 | Suppressor of spurious ringing currents for telephone apparatus | |||
| 290 | 4143247 | Automatic signal level adjusting circuits for use in telephone sets | |||
| 291 | 4140881 | Telephone loop extending apparatus | |||
| 292 | 4132863 | Automatic gain and return loss compensating line circuit | |||
1978 | |||||
| 293 | 4107477 | Multi-subscriber telephone apparatus | |||
| 294 | 4079211 | Protection device for a subscriber's telephone set | |||
| 295 | 4071713 | Telephone speech network | |||
| 296 | 4068282 | Protective device for low current transmission circuits | |||
1977 | |||||
| 297 | 4048647 | Solid state disconnect device | |||
| 298 | 4039759 | Line security device | |||
| 299 | 4002852 | Electronic telephone network | |||
1976 | |||||
| 300 | 3989902 | Alternating current regulator for use with telephone type line | |||
| 301 | 3962664 | Current protector | |||
| 302 | 3961229 | Two pair station protector | |||
| 303 | 3947730 | Telephone line surge protecting device | |||
| © 2017, ПАТ-Инфо, В.И. Карнышев
Дата формирования списка: 03.04.2017 | |||||