H04M 19 - Current supply arrangements for telephone systems

Patents for H04M 19 - Current supply arrangements for telephone systems (7,475)
12/1997
12/17/1997	EP0813333A2 Electronic speech circuit arrangement
12/17/1997	EP0813291A2 Circuit arrangement for voltage reversal in a mobile radio apparatus
12/17/1997	CN1036750C Direct-current impressing circuit
12/16/1997	US5699422 Telecommunication device
12/16/1997	US5699420 Bell sound synthesizer
12/11/1997	DE19623097A1 Ringing tone melody generating method for telecommunication terminal
12/10/1997	CN1167558A Digital rural subscriber concentrator system
12/09/1997	US5696817 Apparatus and method for determining the source of a telephone communication
12/09/1997	US5696497 Radio with silent and audible alerts
12/04/1997	DE19717985A1 Telephone ringing volume control method
12/03/1997	CN1166742A Telephone system indicating message waiting status
12/02/1997	US5694465 Integrated ringer for short telephone lines
11/1997
11/27/1997	DE19620624A1 Telecommunication terminal with hearing-sensitive incoming call signal
11/26/1997	EP0809386A2 Device for cordless telephones
11/26/1997	CN1166071A Charging power selling machine for carrying telephone
11/25/1997	US5692043 Enclosure for remote terminal in a distributed digital loop system with trunk unit interface
11/19/1997	EP0808053A2 Self-monitoring line interface circuit
11/19/1997	EP0808050A1 Telephone apparatus
11/19/1997	CN1165603A Supply voltage swiching apparatus
11/19/1997	CN1165598A Incoming calling system
11/19/1997	CN1165597A Driving stage
11/13/1997	WO1997042750A1 Method and arrangement for increasing onhook voltage
11/13/1997	DE19617509A1 Automatic connection termination method for radio telephone
11/12/1997	EP0806859A2 Dual voltage, self-monitoring line circuit
11/12/1997	EP0806106A1 Terminal for wirebound telecommunication
11/12/1997	EP0806102A1 Telephone line interface circuit
11/12/1997	CN1164808A Method of and telephone with, call-reminding and auto-dialing
11/11/1997	US5687227 Telephone with user recorded ringing signal
11/11/1997	CA2123847C Low frequency discriminator circuit
11/06/1997	DE19712567A1 Telephonsystem, das einen Nachrichten-Wartezustand anzeigt Telephone system, indicative of a message waiting state
11/04/1997	US5684874 Ringtrip judging circuit
11/04/1997	US5684391 Circuit arrangement for powering at least one load
10/1997
10/30/1997	WO1997032438A3 Cable access device and method
10/30/1997	DE19713166A1 Mobile communication digital exchanger
10/28/1997	US5682423 Electrical power and telephone ringer signal distribution system
10/22/1997	CN1162996A Method for detecting a signal
10/22/1997	CN1036238C Radio selective call receiver
10/09/1997	WO1997032439A3 A communication network terminal supporting a plurality of applications
10/09/1997	DE19613170A1 Mobile radio apparatus with voltage supply source
10/07/1997	US5675640 Telephone ringing signal detector
10/07/1997	US5675626 Cellular and battery backup telecommunication system
10/02/1997	WO1997036448A1 Communication method for mobile terminals, incoming call receive control system for mobile terminals, and incoming call notification apparatus
10/02/1997	WO1997036385A1 Mobile communication device
10/01/1997	CN1160959A Constant-current and constant-voltage feeder apparatus
09/1997
09/30/1997	US5673117 Data communication apparatus with detachable network control unit
09/24/1997	CN2263425Y Program-control switchboard subscriber interface feeding device
09/23/1997	US5671272 Current mode ring trip detector
09/21/1997	CA2199886A1 Telephone line connector
09/18/1997	WO1997034363A1 Switching controller
09/18/1997	DE19609634A1 Schaltregler Switching Regulators
09/17/1997	EP0796033A1 Telephone provided with an electromechanical transducer, method for adapting the frequency response of such a transducer and method for coding a melody
09/17/1997	EP0795989A2 Method and arrangement for the generation of tones in a wireless telecommunication system
09/17/1997	EP0795845A2 Communication apparatus capable of announcing reception of a call by a melody sound composed by a user
09/17/1997	EP0719488B1 Power supply controller for an optical fibre telecommunications system
09/13/1997	CA2199797A1 Data transmitter-receiver
09/12/1997	WO1997033446A1 Remote test of a wireless subscriber connection
09/12/1997	WO1997033260A1 Event sensing circuit and alert generator
09/12/1997	CA2248146A1 Remote test of a wireless subscriber connection
09/09/1997	US5666406 Hazard prevention for telephone line interface circuits
09/09/1997	US5666397 Individual telephone line call event buffering system
09/09/1997	US5666355 Power consumption control method and apparatus for a communication system subscriber unit
09/04/1997	WO1997032439A2 A communication network terminal supporting a plurality of applications
09/04/1997	WO1997032438A2 Cable access device and method
09/03/1997	EP0793325A2 Circuit for providing an operating voltage for a plurality of preferably plug-in units from a common operating voltage source
09/03/1997	EP0792549A1 Method and apparatus for determining the deviation of longitudinal signal components from a predetermined value
09/03/1997	EP0792548A1 Dc level control for an electronic telephone line card
09/03/1997	EP0792541A1 Incoming calling system
09/03/1997	CN1158530A Circuit for telephone set comprising light-emitting diode power supply
09/02/1997	US5664002 Method and apparatus for providing power to a coaxial cable network
09/02/1997	US5663878 Apparatus and method for generating a low frequency AC signal
09/02/1997	US5663673 Output circuit having at least one external transistor
08/1997
08/27/1997	EP0791405A2 Vibration actuator for pager
08/27/1997	EP0791264A1 Supply voltage switching apparatus
08/27/1997	EP0791245A1 Driving stage
08/27/1997	CN1158197A Method and apparatus for determining the deviation of longitudinal signal compounts from a predetermined value
08/27/1997	CN1158196A Telephone line interface circuit
08/26/1997	US5661794 Telephone line interface circuit with voltage control
08/26/1997	US5661791 Method and apparatus for enhanced distinctive call redirection
08/26/1997	US5661788 Method and system for selectively alerting user and answering preferred telephone calls
08/26/1997	US5661780 Cordless telephone having power failure detection circuit
08/26/1997	US5661776 Method and apparatus for performing impedance measurements on a communication line
08/26/1997	CA2131294C Wideband telephone line interface circuit
08/20/1997	CN1157518A Ring detecting circuit and method for wireless/wired composite telephone
08/20/1997	CA2197534A1 Vibration actuator for pager
08/19/1997	US5659610 Battery feed circuit
08/19/1997	US5659608 Line feed circuit with logic level controlled ringing
08/14/1997	WO1997029585A1 Line cards for uvg, coin, isdn, and special services
08/14/1997	WO1997029580A1 Telecommunications networks
08/14/1997	WO1997021298A3 Method of detecting operating states of an electrical apparatus and electrical apparatus for detecting apparatus-specific operating states
08/14/1997	CA2244000A1 Line cards for uvg, coin, isdn, and special services
08/13/1997	EP0789478A2 Circuit arrangement for decentralised power feeding having low standby current
08/13/1997	EP0789477A2 Subscriber line interface circuit realizable in C-MOS technology
08/13/1997	EP0788708A1 Low loss telephone circuit
08/12/1997	USRE35582 Subscriber line interface circuit with power-down mode
08/07/1997	WO1997028655A1 Box or frame related line resistors
08/07/1997	WO1997028631A1 Telecommunications functions management system
08/06/1997	EP0787399A1 Method and apparatus for providing a look ahead feature for enhanced call forwarding in a telecommunications system
08/05/1997	US5655016 Distinctive telephone annunciator
08/05/1997	US5655013 Computer-based method and apparatus for controlling, monitoring, recording and reporting telephone access
08/05/1997	US5655010 Line-powered modem with capacitive isolation

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