Patents for H04M 19 - Current supply arrangements for telephone systems (7,475) |
---|
08/05/1997 | US5654592 Power supply controller |
07/31/1997 | WO1997022887A3 Method for displaying a 'low battery' state in electrical equipment with electrical energy stores and electrical equipment with electrical energy stores with means for displaying a 'low battery' state |
07/31/1997 | DE19653588A1 Cordless telephone call detection circuit |
07/30/1997 | EP0786093A1 Method for detecting a signal |
07/24/1997 | WO1997026633A1 Mobile telephone warning device |
07/23/1997 | CN1155204A Subscriber's line interface circuit capable of realizing by CMOS circuit |
07/22/1997 | US5651052 Apparatus and method for incoming call detection and alarm circuitry for cellular telephones |
07/17/1997 | DE19600935A1 Mains-independent radio receiver with continuous standby capability |
07/15/1997 | US5649020 Tactile alerting system |
07/15/1997 | US5649009 Differential longitudinal amplifier for a subscriber line interface circuit |
07/15/1997 | US5649007 Telephone set of distinctive ringing type capable of generating different calling sounds after the telephone set is connected to remote calling party |
07/15/1997 | US5649006 Communication apparatus having function of generating calling signal |
07/15/1997 | US5649002 Method and apparatus for detecting a telephone CPE alerting signal |
07/10/1997 | DE4227601C1 Call tone control for telephone handset |
07/03/1997 | DE19654576A1 Tragbares schnurloses Endgerät mit getrennter Schwingungserzeugungsschaltung A portable wireless terminal with separate wave generating circuit |
07/02/1997 | EP0782257A1 Impedance matching device for supply line |
06/26/1997 | WO1997022887A2 Method for displaying a 'low battery' state in electrical equipment with electrical energy stores and electrical equipment with electrical energy stores with means for displaying a 'low battery' state |
06/25/1997 | EP0780991A2 Adaptor cable for a mobile radio |
06/24/1997 | US5642413 Telephone call alert device with selectable alert modes |
06/24/1997 | US5642412 Isolated high impedance, DC current sources for telecommunications applications |
06/19/1997 | DE19620834C1 Cordless telephone combined base station and charging station |
06/19/1997 | DE19547019A1 Verfahren zum Anzeigen des Zustands "Energiespeicher erschöpft" in Elektro-Geräten mit Elektro-Energiespeichern und Elektro-Geräten mit Elektro-Energiespeichern zum Anzeigen des Zustands "Energiespeicher erschöpft" A method for displaying the state "low energy store" in electrical appliances with electric-energy storage and electric appliances with electric energy storage devices for indicating the state "low energy store" |
06/17/1997 | US5640441 Apparatus and method for incoming call detection and alarm circuitry for cellular telephones |
06/12/1997 | WO1997021300A1 Method and apparatus for generating a ringing signal |
06/12/1997 | WO1997021298A2 Method of detecting operating states of an electrical apparatus and electrical apparatus for detecting apparatus-specific operating states |
06/12/1997 | CA2239051A1 Method and apparatus for generating a ringing signal |
06/11/1997 | CN1151648A Circuit for controlling on-hook voltage by use of balanced amplifier without supplying constant current to balanced amplifier |
06/11/1997 | CN1151644A Ring trip circuit having simple trip detecting circuit of high response speed |
06/10/1997 | US5638421 Apparatus and method for incoming call detection and alarm circuitry for cellular telephones |
06/05/1997 | WO1997020426A1 Terminal for wirebound telecommunication |
06/04/1997 | EP0776565A1 Improved communications marketing system |
06/04/1997 | EP0668001B1 Process for programming a base station using a mobile unit |
06/03/1997 | US5636274 Switch controller and method |
06/03/1997 | US5636273 Integrated ring detection circuit and power cross detection circuit with persistence timers |
06/03/1997 | US5635897 Mobile phone alarm |
05/29/1997 | WO1997019457A1 Switch with inductor function |
05/29/1997 | WO1997019429A1 Displaying graphic messages in a radio receiver |
05/28/1997 | EP0776115A2 Double-acting mobile communication apparatus for facilitating its hands-free use |
05/28/1997 | EP0775388A1 Power consumption control method and apparatus for a communication system subscriber unit |
05/27/1997 | US5633925 Low loss telephone circuit |
05/22/1997 | DE19543365A1 Ringing circuit with automatic volume control for radiotelephone, door bell or alarm |
05/22/1997 | DE19542730A1 Programmable call signal accessory for telephone handset |
05/21/1997 | EP0632937B1 DC/AC Power supply |
05/15/1997 | DE19543040A1 Incoming telephone call signalling device for ISDN system |
05/14/1997 | EP0773519A2 Vending machine for charging a secondary battery of a mobile phone |
05/13/1997 | US5629931 Information transmission system |
05/09/1997 | WO1997016932A1 Selective notification method for portable electronic devices |
05/07/1997 | EP0772334A2 Radiotelephone |
05/07/1997 | EP0636295B1 Wideband telephone line interface circuit |
05/07/1997 | DE19541018A1 Intercom system with telephone sets for two users |
05/06/1997 | US5627890 Telephone line interface circuit |
05/06/1997 | US5627491 Plural stage circuit with automatic adaptation to first and second voltage ranges of a common voltage source |
04/30/1997 | DE19539899A1 Communication apparatus with acoustic calling signal |
04/29/1997 | US5625683 Method of and telephone with call-reminding and auto-dialing |
04/24/1997 | WO1997015135A1 Telephone isolation device |
04/24/1997 | DE19545762C1 Operating condition detection system for cordless mobile telephone |
04/24/1997 | DE19537224A1 Power consumption reduction demand for wireless telephone |
04/23/1997 | CN1148314A sound volume setting device for portable telephone |
04/22/1997 | US5623544 Telephone headset interface circuit |
04/22/1997 | US5623531 Auxiliary power for telephone distribution system |
04/22/1997 | US5623321 Circuit for cutting off power to an active RF component |
04/17/1997 | DE19635288A1 Telephone reception signal, volume changing method |
04/16/1997 | EP0768784A2 Circuit arrangement for displaying information characterising the status of the switching network |
04/16/1997 | CN1147731A Communications terminal apparatus and display method thereof |
04/16/1997 | CN1147730A Radio receiving terminal |
04/10/1997 | DE19635289A1 Current supply control circuit for mobile radio/communications system |
04/09/1997 | CN2251844Y Working stabilizing reliable feeder amplifier |
04/08/1997 | US5619568 Cordless phone with time-out controlled ringer |
04/08/1997 | US5619567 Variable DC feed characteristic in a subscriber line interface circuit |
04/08/1997 | US5619252 Video telephone system and method for transmitting and receiving signals when there is a failure in the system |
04/02/1997 | EP0766448A2 Network powered telecommunication terminal with telephone handset connected to the telecommunication network via a terminal specific-digital signal processing device |
04/02/1997 | EP0766447A2 Data acess arrangement with telephone interface |
04/02/1997 | EP0766436A1 Circuit for a telephone set comprising a light emitting diode power supply |
04/02/1997 | EP0765561A1 Communication device |
04/01/1997 | US5617472 Noise suppression of acoustic signal in telephone set |
04/01/1997 | CA2046248C Power conserving technique for a communications terminal time slot interchanger |
03/27/1997 | WO1997011532A1 Incoming calling system |
03/26/1997 | EP0765069A2 Circuit for controlling an on-hook voltage by the use of a balanced amplifier without supplying a constant current to the balanced amplifier |
03/26/1997 | CN1146263A Power management for line powered telecommunication apparatus |
03/18/1997 | US5612998 Integrated interface circuit for driving a subscriber line |
03/18/1997 | CA2062870C Line interface circuit |
03/12/1997 | CN1145001A Circumscribed full-automatic communication connector |
03/11/1997 | US5610978 Ring discriminator |
03/06/1997 | WO1997004574A3 Telephone exchange |
03/05/1997 | EP0760576A1 An Integrated ringer relay circuit and method |
03/04/1997 | US5608795 Telephone line interface circuit |
03/04/1997 | US5608792 Apparatus for drawing and processing electrical power from a communications line |
02/27/1997 | DE19630629A1 Faulty operation prevention circuit especially for setting apparatus in cordless telephone |
02/25/1997 | US5606313 Low power addressable data communication device and method |
02/20/1997 | WO1997006630A1 Power supply for telecommunications devices |
02/20/1997 | WO1997006629A1 Remote supply of decentralised (especially narrow-band) devices in wide-band fibre-optic lines and subscriber connection systems having copper remote supply lines |
02/19/1997 | EP0758518A1 Telecommunication system |
02/19/1997 | CN1143292A Ringing current power source of program controlled exchanger |
02/18/1997 | CA2105376C Telephone line interface circuit with voltage switching |
02/13/1997 | DE19529183A1 Fernspeisung von dezentralen (insbesondere Schmalband-) Einrichtungen in optische Breitband-Anschlußleitungen und Kupfer-Fernspeisungsleitungen aufweisenden Teilnehmeranschlußnetzen Remote powering of distributed (in particular narrowband) means having in optical broadband access lines and copper-remote supply lines subscriber access networks |
02/12/1997 | EP0533755B1 Communications-transmission system |
02/12/1997 | CN2247399Y Multi-function domestic robbery-proof alarm device |
02/11/1997 | US5602911 System and method for eliminating bell tap on analog telephones |
02/11/1997 | US5602908 Calling party identifying apparatus and method therefor |
02/11/1997 | US5602900 Radio Telecommunication apparatus |