| Patents for H04M 19 - Current supply arrangements for telephone systems (7,475) |
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| 05/12/1998 | US5752203 Portable radio apparatus having cable-incorporated hand strap |
| 05/12/1998 | US5752183 Method and apparatus for reducing power consumption in a subscriber unit of a communication system |
| 05/07/1998 | WO1998019480A2 Method and apparatus for downloading tones to mobile terminals |
| 05/06/1998 | EP0839426A2 Telephone exchange |
| 05/05/1998 | US5749067 Voice activity detector |
| 05/05/1998 | CA2069659C Telephone alerter |
| 04/30/1998 | DE19644667A1 Call signalling method for mobile radio subscriber |
| 04/28/1998 | US5745563 Telephone subscriber line circuit, components and methods |
| 04/28/1998 | US5744933 Vending machine for charging a secondary battery of a mobile phone |
| 04/23/1998 | DE19744652A1 Automatic multi-tune telephone music on hold apparatus |
| 04/23/1998 | DE19641755A1 Cordless telephone apparatus |
| 04/21/1998 | US5742676 Circuit for telephone set comprising a light-emitting diode power supply |
| 04/21/1998 | CA2152901C Method of providing d.c. feed to a telephone line |
| 04/14/1998 | US5740241 T1 channel bank control process and apparatus |
| 04/09/1998 | WO1998015110A2 Remote supply circuitry |
| 04/08/1998 | EP0835020A2 Analog subscriber terminal provided with additional functions |
| 04/08/1998 | CN2278315Y Constant current and voltage feeding device |
| 04/08/1998 | CN2278314Y Detector for phone hanging up and taking off |
| 04/08/1998 | CN1178424A Telemetering apparatus |
| 04/07/1998 | US5737411 Battery switching in a telephone subscriber line interface circuit |
| 04/02/1998 | WO1998013999A2 Power supply circuit, telecommunication device and method for multiple dc slope power management |
| 04/02/1998 | WO1998013978A2 Current distribution circuit having an additional parallel dc-current sinking branch |
| 04/02/1998 | WO1998013744A2 Method and arrangement for controlling functions in a programme-controlled circuit in the event of operating voltage failure |
| 04/02/1998 | DE19639644A1 Verfahren und Anordnung zur Steuerung von Funktionen in einer programmgesteuerten Schaltungsanordnung bei Ausfall der Betriebsspannung Method and apparatus for controlling functions in a program-controlled circuitry failure of the operating voltage |
| 04/02/1998 | DE19638268A1 Electrical power supply system for analogue terminal |
| 04/01/1998 | EP0833466A2 Isolation apparatus for electronic equipment |
| 04/01/1998 | EP0833455A2 Exchangeable hardware module for radiotelephone |
| 04/01/1998 | CN1177904A Improved isolation device for electronic equipment |
| 03/31/1998 | US5734714 Subscriber line interface circuit capable of realizing by a C-MOS circuit |
| 03/31/1998 | US5734712 Method for off-hook detection during ringing and the use of a subscriber line interface circuit for off-hook detection during ringing |
| 03/31/1998 | US5734711 Telecommunication system with energy-saving mode |
| 03/25/1998 | EP0831629A2 Mobile telephone and method for selectively displaying one of a plurality of graphical information sequences |
| 03/18/1998 | EP0830044A1 Communication method for mobile terminals, incoming call receive control system for mobile terminals, and incoming call notification apparatus |
| 03/18/1998 | EP0830035A2 Electronic backplane device for a fiber distribution shelf in an optical fiber administration system |
| 03/18/1998 | EP0829999A1 A dynamic propagation supervisor |
| 03/18/1998 | EP0829998A2 Subscriber line circuit |
| 03/18/1998 | EP0829796A1 Voltage controller with attenuated temperature sensitivity |
| 03/17/1998 | US5729589 Apparatus and method for incoming call detection and alarm circuitry for cellular telephones |
| 03/12/1998 | WO1998010582A1 Electronic impedance supply circuit |
| 03/12/1998 | WO1998010572A1 Mobile telephone terminal |
| 03/12/1998 | DE19636282A1 Telefonendgerät Telephone terminal |
| 03/11/1998 | EP0667084B1 Information transmission system |
| 03/11/1998 | CN1175867A Control of receiver terminal by sender terminal before sender terminal goes off hook |
| 03/05/1998 | WO1998009255A1 Method for crediting or recrediting a data card with a given amount |
| 03/05/1998 | WO1998001990A3 Power supply system for telephone line wires |
| 03/05/1998 | DE19634863A1 Portable telephone multi-function group |
| 03/05/1998 | CA2264171A1 Method for crediting or recrediting a data card with a given amount |
| 03/04/1998 | EP0827322A2 Telemetry apparatus |
| 03/04/1998 | EP0827119A1 Method for charging or recharging a data carrying card with a monetary value |
| 03/04/1998 | CN1175178A Circuit distribution for voltage polarity reversal in mobile radio equipment |
| 03/03/1998 | US5724468 Electronic backplane device for a fiber distribution shelf in an optical fiber administration system |
| 03/03/1998 | US5724411 Method for selectively alerting multiple telephones of an incoming call |
| 03/03/1998 | US5723996 Leadframe for plastic-encapsulated semiconductor device, semiconductordevice using the same, and manufacturing method for the leadframe |
| 02/26/1998 | WO1998008336A1 Digital direct current feed control for a communication system |
| 02/26/1998 | DE19723968A1 Metal hybrid or cadmium battery charging method for e.g. radio telephone |
| 02/25/1998 | EP0825754A1 Sine wave ringing generator |
| 02/25/1998 | EP0825751A2 Control of a telecommunication receiving terminal by a transmitting terminal before the receiver terminal goes off the hook |
| 02/25/1998 | EP0824788A1 Isolating circuit for telephone apparatus |
| 02/25/1998 | CN1174483A Call processing method. subscriber unit, and access control apparatus operated in wireless local loop system |
| 02/25/1998 | CN1174469A Subscriber circuit with built-in polarity switching circuit |
| 02/24/1998 | US5722071 Portable receiver including transducer for notifying user of messages received in a remote mobile communications device |
| 02/24/1998 | US5721776 Telephone line connector |
| 02/24/1998 | US5721774 Longitudinally balanced, dual voltage line-feed circuit |
| 02/24/1998 | CA2131296C Impedance generator for a telephone line interface circuit |
| 02/24/1998 | CA2131295C Telephone line interface circuit with voltage control |
| 02/19/1998 | WO1998007265A1 Programmable cellular telephone with scheduled function activation and deactivation |
| 02/19/1998 | DE19633171A1 Cordless telephone hand-piece with support housing |
| 02/19/1998 | CA2262592A1 Programmable cellular telephone with scheduled function activation and deactivation |
| 02/18/1998 | CN2274850Y Energy saver for program controlling exchange client module |
| 02/18/1998 | CN1173685A Vibration actuator for pager |
| 02/17/1998 | US5719929 Generalizing specialized telephone numbers |
| 02/12/1998 | WO1998006158A1 Power supply with replaceable rectifier and converter units |
| 02/05/1998 | WO1998005151A1 Telephone identification calling apparatus and procedures |
| 02/05/1998 | DE19638127A1 Cordless telephone set with switch responsive to handling by user |
| 02/05/1998 | DE19624300A1 Cordless hands-free telephone apparatus with bidirectional signalling |
| 02/03/1998 | US5715278 Standby power saving in mobile phones |
| 01/28/1998 | CN2273473Y Constant-current feeding and 2\4 wire conversion equipment |
| 01/27/1998 | US5712910 Ring trip circuit having a simple trip detecting circuit of a high response speed |
| 01/27/1998 | US5712779 DC electrical power supply system |
| 01/20/1998 | US5710808 Telephone dialling code processor |
| 01/15/1998 | WO1998001990A2 Power supply system for telephone line wires |
| 01/15/1998 | WO1998001983A1 An arrangement for controlling subscriber interface circuits |
| 01/15/1998 | DE19628022A1 Current source control method |
| 01/15/1998 | CA2259400A1 An arrangement for controlling subscriber interface circuits |
| 01/08/1998 | DE19717151A1 Energy saving communication terminal e.g. for facsimile apparatus |
| 01/08/1998 | DE19626492A1 Current change-with-time detection circuit e.g. for SO |
| 01/07/1998 | EP0775388A4 Power consumption control method and apparatus for a communication system subscriber unit |
| 01/06/1998 | US5706343 Integrated interface circuit for driving a subscriber line |
| 01/06/1998 | US5706157 Power distribution system with over-current protection |
| 01/02/1998 | DE19627447A1 Mobile telephone operation apparatus |
| 01/02/1998 | DE19623828A1 Schaltungsanordnung zur Spannungsumpolung Circuit arrangement for voltage reversal |
| 12/31/1997 | CN1169076A Telephone including electromechanical transducer, method of adapting frequency response of such transducer and method of coding melody |
| 12/30/1997 | US5703931 Portable radio telephone with impulse movement or sound off-hook production and signalling |
| 12/29/1997 | EP0813787A1 A telephone set having calling party dependent ringing |
| 12/24/1997 | CN1168615A Radio communication apparatus with adjustable alert tone |
| 12/24/1997 | CN1168608A Communication apparatus capable of announcing reception of call by melody sound composed by user |
| 12/23/1997 | US5701329 Standby power savings with cumulative party check in mobile phones |
| 12/18/1997 | WO1997048223A1 Device at telecommunication system |
| 12/18/1997 | WO1997048160A1 Circuitry for voltage pole reversal |
| 12/18/1997 | DE19726432A1 Connecting cable for apparatus needing LV supply and telephone leads |