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2017

19553992Automated emergency notification system

2016

29503568Detecting dial tone on a telephone line
39462100Method and earpiece for visual operational status indication
49313312Speech recognition method of and system for determining the status of an answered telephone during the course of an outbound telephone call

2015

59219814Communication apparatus and control method therefor
69137597Method and earpiece for visual operational status indication
79137359Terminal and method for managing call function
89100499Communication apparatus and method with off-hook detection and power supply control
99094510System and method for pre-call messaging for a wireless device

2006

107069432System and method for providing security in a telecommunication network
117023981Method and apparatus for signal detection

2005

126947546Hook-flash simulation in parallel with off-hook devices
136947526Systems and methods for monitoring audio
146937717Low power signal detection
156928159Telephone for connection to a public telephone network
166914977Method and apparatus for programming guestroom telephones
176895085System and method for preventing telephone line blocking by a modem
186879686Line take-up detection circuit
196876741Device for detecting telephone line seizure
206870919Mute status reminder for a communication device

2004

216785383Telephone line switch using an optocooupler
226757378Method and telecommunications center for recognizing connection requests at a subscriber line
236754339Message transmission system
246744873Telephone accessory device
256738460Apparatus for indicating caller availability
266724889Method and system for line status indicators using line side power
276718037Computer with a modem capable of outputting telephone bell signals
286711257Telephone indicator system and method
296711238Parallel-connected dialing signal transmission inhibiting device for data transfer over a telephone link
306697456Speech analysis based answer detection for IP based telephones
316694011Method and system for reliably detecting voiceband signaling tones
326690778Method and apparatus for automatically adjusting an electronic device output in response to an incoming telephone call
336687369Telephone signal discriminator
346681011Method and modem circuit using a dither signal for determining connection status of a phone line
356678362System and method for effectively managing telephone functionality by utilizing a settop box

2003

366661893Telephone loop monitoring and isolation system
376650751Answer detection for IP based telephones using passive detection
386631190Telephone system
396628771Distinctive call waiting alert and management device
406625276Method and circuit for detecting ring and caller-ID signals
416625263Method, device for detecting the calling of a telephone and modem including such a device
426584195Telephone apparatus
436567520Method and apparatus for detecting multiple telephone off-hook conditions
446556673Telephone ring signal detector
456556663Guestroom telephone having single action message retrieval
466539085Automatic phone line re-allocation

2002

476473498Method and system for maximizing use of a communication line
486470083Telecommunications off-hook and intrusion detection method and apparatus
496445796Automatic telephone-line disconnect system
506442255Automatic subscriber callback system
516408067Methods and apparatus for intercepting dual-tone multi-frequency (DTMF) signals and for redialing the intercepted signals with additional DTMF signals
526393123Method and modem circuit for determining connection status of a phone line
536384946Electrical isolation between IR receiver and further electronic circuits
546359972Line in use detection
556345096Central office line interfacing circuit

2001

566292546Modem including a device for detecting the busy state of a telephone line
576212265Method and apparatus for electronic mail notification
586208731Multisensing circuitry for class signals and stutter dial tone in visual message waiting indicator
596201855Telephone handset off switchhook and call holding alert system
606195423Two line voice/data switch
616192128Current-sensitive telephone-line disconnect system
626192057Mechanism to control telecommunication connections in a digital switching network
636185296Ring trip circuit for stopping call signal at different timing from zero-crossing point of call signal
646173054Adaptive call progress tone detection system
656173040Telephone line state detecting device
666172985Automatic detection of pots line

2000

676164550Fault detection and modification circuit
686163447Telephone equipment protection circuit
696157712Speech immunity enhancement in linear prediction based DTMF detector
706154537Method and apparatus for reducing false ringback detection
716141406Method and apparatus for detecting a secondary destination of a telephone call based on changes in the telephone signal path
726134321Modem loop current detect system to detect an off-hook condition in an extension telephone
736134266Modem system with voice message function
746101252CAS tone disguising method and apparatus
756101249Automatic call screening telecommunication device
766091812Apparatus and method for automatically switching a headset between a telephone and a second audio source
776085070Radio communicating apparatus
786084947Digital signal detector and method
796072869Adaptive method and apparatus for detecting a stutter dial tone signal
806052446Communication device that identifies and stores and incoming signal and transmits the signal to a computer
816049605Telephone line access arrangement
826041107Telephone extension switch hook state detection system

1999

835991371Communication apparatus
845987120Device for identifying line reversal/ringing signal of a telephone set
855987106Automatic volume control system and method for use in a multimedia computer system
865982878Combined loop current sink, battery detector, and ringing detector circuit
875930351Remote telephone ringer controller
885926542Telephone circuit capable of inhibiting noise of customer premises equipment alerting signal
895926541Apparatus and method for checking signals
905923748Telephone device for preventing a long-term on-line state resulting from the handset being unintentionally off-hook
915920623Method and apparatus for defeating a predictive telemarketing system
925901219Method for ring signal detection
935898756Parallel-connected dialing signal transmission-inhibiting device for data transfer over a telephone link
945864607Communication with a computer using telephones
955859906Telephone switch hook interface circuit

1998

965844977On-hook customer premise equipment alerting signal detection
975841850Intelligent caller identification apparatus for notifying a selected telephone number of the arrival of special information
985832075Off-hook detector for headset
995825852Multisensing circuitry for class signals and stutter dial tone in visual message waiting indicator
1005822406Switching circuit for automatically routing audio and data signals between a modem, telephone, and I/O devices
1015809132Communication terminal device
1025802166Dual signal triggered message waiting notification system for indicating storage of different types of messages awaiting retrieval
1035771285Circuit and method for detecting telephone line status and telephone instrument embodying the same
1045768366High voltage message waiting circuit
1055768365Circuit for sensing telephone line conditions
1065764758Interrupted tone converter
1075764752Off-hook telephone clearing system
1085754628Method of providing telecommunications network-based message services
1095748712Facsimile system of distinctive ringing type capable of automatic facsimile reception even when received call signal calls telephone number for telephone reception
1105742671Self-adjusting telephone line status detection indication
1115727056Parallel-connected telephone use determining circuit in a cordless telephone system and method thereof
1125715302Apparatus and method for executing mode conversion of a facsimile system into automatic mode
1135706342Method and apparatus for off-hook detection

1997

1145699418Telephone circuit
1155699414Method and apparatus for sharing a single telephone line between a facsimile machine, data modem, telephone answering device, and a person
1165696817Apparatus and method for determining the source of a telephone communication
1175692040Method of and apparatus for exchanging compatible universal identification telephone protocols over a public switched telephone network
1185675640Telephone ringing signal detector
1195668870Audible signaling device for informing when a telephone line is available or in use
1205666403Method and apparatus for sharing a single telephone line between a facsimile machine, data modem, telephone answering device, and a person
1215664008Message waiting adjunct device
1225638436Voice detection
1235612997Off-hook disconnect and reconnect ringer device
1245608797On-line indicator for multipurpose headset amplifier
1255608794Telephone headset in-use indicator
1265606593Apparatus and method for automatically returning a telephone set to an on-hook condition
1275602914Device for limiting the working voltage for mechanical switches in telephony
1285602911System and method for eliminating bell tap on analog telephones
1295600715Integrated loop current detector apparatus for a PSTN modem
1305594788Telephone system and interface device
1315592529Telephone inadvertent off-hook condition detector

1996

1325570418Device for detecting operation state of telephone hook switch
1335553116Telephone line monitoring apparatus and method
1345546025Low frequency discrimator using upper and lower thresholds
1355544241Telephone ring detector
1365542102Method and apparatus for simultaneously controlling base station and external electronic device functions
1375539812Method and apparatus for detecting an attempted three-way conference call on a remote telephone
1385535265Method and circuitry for controlling voice mail, call logging and call blocking functions using a modem
1395533117Line status indicator for use with telephones sharing a single line
1405528673Switching device for controlling power to appliances and muting audio devices in response to a telephone call
1415521974Line in-use indicator for a telephone set and facsimile machine connected to a single telephone line
1425521967Method for monitoring telephone call progress
1435513253Facsimile apparatus
1445509068Electronic ring monitoring device for telecommunications line
1455506891Method and apparatus for detecting the connection status of an extension phone connected to a voice/fax/data modem
1465506885Method of adapting processing parameters in a call processing system
1475499287FAX-telephone interface circuit
1485490210Programmable telephone interface device
1495488654Telemetry device including a dynamic off-hook detector capable of operationg in a pulse-dialing environment
1505485508Hybrid communication devices with one telephone line
1515481373Facsimile apparatus and telephone terminal apparatus having voice and image communication functions

1995

1525479499Sensor circuit for voice/fax switch with cascaded amplifier circuit
1535459781Selectively activated dual tone multi-frequency detector
1545450485Detecting whether a telephone line has been disconnected
1555448636Device for limiting the working voltage mechanical switches in telephony
1565446784Apparatus for coupling a telephone line to a telephone line subscriber device
1575442694Ring tone detection for a telephone system
1585438618Vocal frequency suppression apparatus and method
1595428680DTMF signal receiving apparatus equipped with a DTMF signal judging circuit
1605428674Communication terminal device and dialing key
1615428662Detecting make-break clicks on a telephone line
1625426698Transformed current sensing relay for use in switched network modems and circuit incorporating same
1635422947Telephone in-use indicator
1645422939Parallel off-hook detection for both line-available and phone pick-up detection
1655420907Automatic control system for a remotely controllable sound producing device
1665414764Communications apparatus
1675409178Method and apparatus for winding and unwinding printed products in scale formation
1685408525Diverter interface between two telecommunication lines and a station set
1695404399Telephone visual signaling device
1705400398Electronic telephone set with low power hook switch
1715392334Off-hook detection and soft line seizure for telephone line sharing in a computer system
1725390249Receiver device for receiving ringing signals in an off-hook line condition
1735388153Apparatus and method for detecting telephone line status

1994

1745371787Machine answer detection
1755369688Data communication apparatus with interrupt completion detecting
1765359647Headset in-use indicator
1775349639Automatic electronic audio signal attenuating device and method therefor
1785349254Call progress detection circuit
1795347572Telephone line monitoring apparatus and method
1805345495Data diagnostics with leds on the face of a telephone
1815343514Telephone line powered system
1825333190Telephone ring detection method and apparatus
1835327494Dial tone annunciating system and method
1845327493Device for detecting tones on telephone lines
1855325425Method for monitoring telephone call progress
1865319702Method and apparatus for detecting and responding to hook flash events occurring on a remote telephone
1875315650Caller identification transmit path limiter
1885311588Call progress detection circuitry and method
1895311587Sensor circuit for telephone line
1905307404Signal detecting device
1915291545Apparatus and method for determining the state of a telephone line
1925287404Telephone subscriber line voltage change detection
1935280523Telephone line message waiting and ring indicator

1993

1945251256Independent hysteresis apparatus for tone detection
1955243642Telephone call management device
1965239574Methods and apparatus for detecting voice information in telephone-type signals
1975233649Telephone ringing module
1985233646Telephone-operated stereo shut-off device
1995210791Telephone headset on-line indicator
2005198992Method and apparatus for improving wideband detection of a tone
2015185570Telecommunications signal detector

1992

2025157721Control circuit for an electrical telephone accessory
2035142569Apparatus for selectively enabling subscriber device to respond to ringing signal in dependence upon ringing cadence
2045140631Apparatus and method for determining the state of a telephone line
2055128987Telephone-responsive device for muting the sound output of a television set
2065111502Telephone line bridging sensor
2075091934Tone modification system for telephone system with clock

1991

2085073921Line connection switching apparatus for connecting communication line in accordance with matching result of speech pattern
2095063593Tone-type recognition method
2105062131Telephone line monitoring circuit for providing a visual and auditory signal if the telephone line becomes inoperative
2115060259Call progress capability for a switched channel data service unit
2125056131Telephone line monitoring circuitry and apparatus
2135056083Telephone apparatus and a method of controlling same
2145038372Systems for transmitting data via telephone lines
2155023906Method for monitoring telephone call progress
2165007000Classification of audio signals on a telephone line
2175001709Communication system and apparatus
2184998273Telephone line called number recognizer
2194998271Telephone accessory
2204995076Call progress capability for a switched channel data service unit
2214993061Portable miniature high fidelity stereo tape player and cordless radio telephone system

1990

2224979214Method and apparatus for identifying speech in telephone signals
2234969179Telephone line monitoring circuit for providing a visual and auditory signal if the telephone line becomes inoperative
2244969178Multipurpose subscriber local line monitoring device
2254953205Flickering device for telephone sets
2264951311Telephone call indicator
2274949375Automatic positive telephone disconnect system
2284932050Proximity detection for telecommunications features
2294924493Method for monitoring call setup communications
2304922529Automatic hangup apparatus for restoring service to off-hook telephones
2314920561Ring detector for telephone line
2324918720Circuit device for controlling the actuated state of an electric appliance
2334903291Automatic on-hook arrangement

1989

2344873712Telephone controlled interrupter circuit
2354841566Hold and dial accessory for telephone instrument
2364802207Voltage-sensitive telephone line monitor

1988

2374788712Howler indicator in cordless telephone system
2384747131Dial tone detector
2394742537Telephone line monitoring system
2404737984Dial tone detector

1987

2414700385Remote telephone control apparatus
2424686700Telephone off-hook detector circuit
2434686699Call progress monitor for a computer telephone interface
2444686697Telephone care system with telephone line-checking
2454677662Multiple line self-contained telephone
2464675901Automatic disconnect device with protected ringer
2474675898Single tone telephone receiver
2484672663Telephone handset detector
2494669110Call progress tone system
2504669100Charge-coupled device having a buffer electrode
2514667065Apparatus and methods for electrical signal discrimination
2524653094Telephone set line status display
2534653087Stereo interface telephone ring detector
2544648109Light emitting diode message waiting lamp circuit
2554639553Call signal detecting device

1986

2564633040Personal branch exchange system
2574599495Apparatus for multifrequency signalling tone detection
2584584440Telephone disconnect apparatus

1985

2594546490Single frequency detection circuit
2604546214Line use indicator for telephone sets sharing a single line
2614544808Telephone indicator
2624540855Detecting signals within a passband on a telephone line
2634529845Optical coupling interface circuit for telephone line ringing signal indication or detection
2644514596Telephone handsets
2654506115Message alert system

1984

2664477698Apparatus for detecting pick-up at a remote telephone set
2674444999Automatic electronic disconnector for subscriber terminal equipment
2684438527Signal responsive automatic control for audio equipment
2694425477Telephone line triggered attenuator

1983

2704405833Telephone call progress tone and answer identification circuit
2714390843Telephone system ring period detector
2724389543Telephone-activated audio control circuit

1982

2734317964Off-hook/on-hook status check circuit

1981

2744283603On-hook/off-hook status check circuit

1980

2754224478Data transmission circuit for establishing a bidirectional data path in a telephone system
2764220825Telephone status monitor circit

1979

2774156797Filter for voice operated triggering circuits
2784134032Audio signal discriminator circuit

1978

2794109112Telephone isolation device

1977

2804041255Switching circuit for telecommunications lines

1976

2813974401System for detecting the transmission direction of a signal on a two-way transmission line
2823973082Electronic telephone subscriber set with voltage controlled variable shunt
2833939311Muting circuit for subscribers telephone
2843933233Control circuit for subscriber station in video telephone system
© 2017, ПАТ-Инфо, В.И. Карнышев
Дата формирования списка: 03.04.2017