| Patents for H04M 19 - Current supply arrangements for telephone systems (7,475) |
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| 09/17/1986 | CN85109222A Interswitch line circuit |
| 09/16/1986 | US4612417 Electronic battery feed circuit for telephone systems |
| 09/10/1986 | EP0194177A1 Subscriber line interface circuit with a reduced power monitoring mode |
| 09/10/1986 | EP0119234B1 Apparatus for the current supply of a subscriber set from an exchange |
| 09/10/1986 | EP0113747B1 A method for current supply to a subscriber telephone from a telephone exchange |
| 09/10/1986 | CN85108019A Constant current line circuit |
| 09/09/1986 | US4611097 For use with a telephone circuit |
| 09/09/1986 | CA1211241A1 Line feed circuit for a digital signal loop |
| 09/09/1986 | CA1211196A1 Single fault tolerant ccis data link arrangement |
| 09/03/1986 | EP0193244A2 Polarity reversal circuit |
| 09/02/1986 | USH118 Synthesized sound telephone alerting means |
| 09/02/1986 | US4609864 Analog process controller with digital monitor |
| 09/02/1986 | US4609863 Power supply providing stabilized DC from an input voltage of AC superposed on DC without disturbing the input voltage |
| 09/02/1986 | US4609782 Solid state signal insertion circuit and method for use in a telephony system or the like |
| 09/02/1986 | US4609781 BORSHT/SLIC auto balancing technique |
| 09/02/1986 | CA1210880A1 Signal detection circuit |
| 08/26/1986 | US4608461 Subscriber circuit for a telephone network |
| 08/20/1986 | EP0191526A2 Evaluating circuit for alternating currents or voltages |
| 08/19/1986 | US4607141 Active network termination circuit |
| 08/19/1986 | US4607140 For use with tip and ring terminals |
| 08/13/1986 | EP0190806A2 Method and device for producing an acoustic call signal in subscriber apparatuses of telecommunication systems |
| 08/13/1986 | EP0119245B1 Arrangement for supplying current to a subscriber telephone set |
| 08/12/1986 | US4605824 Circuit arrangement for telecommunication exchange systems, particularly telephone exchange systems with switch facilities for emitting signals |
| 08/12/1986 | CA1209732A1 Active impedance line feed circuit with improved ground fault protection |
| 08/06/1986 | CN85109745A Battery-feed circuit for exchange |
| 08/05/1986 | US4604741 Voice and data interface circuit |
| 08/05/1986 | CA1209291A1 Subscriber's telephone circuit |
| 07/22/1986 | US4602130 Dual voltage source feed circuit configuration for a telephone line circuit |
| 07/22/1986 | CA1208385A1 Battery feed circuit for telephone subscriber line |
| 07/16/1986 | EP0187366A2 Line circuit for driving a ringer and a service indicating lamp in a telephone set |
| 07/15/1986 | US4600811 Subscriber line interface circuit |
| 07/08/1986 | US4599494 Ring sense telephone tone ringer circuit |
| 07/08/1986 | CA1207476A1 Electronic tone ringer |
| 07/02/1986 | EP0186214A2 Battery-feed circuit for exchange |
| 07/02/1986 | CN85108230A Ringing signal sending circuit |
| 07/01/1986 | US4598173 Interface circuit for a subscriber line circuit |
| 06/25/1986 | EP0185213A2 Circuit arrangement for overcharge protection of a subscriber current supply circuit, especially in a digital telephone exchange |
| 06/24/1986 | CA1206650A1 Floating dc current source for a subscriber loop circuit |
| 06/24/1986 | CA1206649A1 Subscriber line interface circuit |
| 06/24/1986 | CA1206648A1 Subscriber circuit for a telephone network |
| 06/24/1986 | CA1206645A1 Auto-balance circuit for battery feed in a telephone circuit |
| 06/24/1986 | CA1206644A1 Apparatus for isolating the voice frequency path from the floating battery feed during signalling |
| 06/24/1986 | CA1206643A1 Supervision and dial pulse detection circuit for a telephone subscriber line |
| 06/24/1986 | CA1206640A1 Ringing signal generator |
| 06/24/1986 | CA1206639A1 Current limiter for telephone signalling |
| 06/17/1986 | US4595797 Ringing signal generator for a subscriber telephone set |
| 06/17/1986 | US4595796 Method of and a circuit arrangement for determining current criteria in the lines of a telephone system |
| 06/17/1986 | CA1206238A1 Digital time-division switch |
| 06/03/1986 | US4593389 Simultaneous voice and asynchronous data telephone |
| 06/03/1986 | US4593272 Communication system power arrangement |
| 06/03/1986 | US4593156 For a subscriber line interface circuit having a tip lead |
| 05/28/1986 | EP0182554A2 Keyboard arrangements |
| 05/28/1986 | EP0182475A1 Signal amplifier and telephone line feed circuit |
| 05/27/1986 | US4592069 Line powered modem |
| 05/27/1986 | US4591661 Portable cordless telephone transceiver-radio receiver |
| 05/27/1986 | CA1205228A1 Ring phase loop detector |
| 05/20/1986 | US4590334 Supply circuit included in a DC-magnetized hybrid transformer |
| 05/13/1986 | US4588865 Music on hold for key systems |
| 05/13/1986 | US4588860 Battery feed circuit for telephone subscriber line |
| 05/13/1986 | US4588858 Differential amplifiers and method of differentially driving a two-wire line circuit |
| 05/09/1986 | WO1986002795A1 Interswitch line circuit |
| 05/07/1986 | EP0179812A1 Circuit for maintaining the dc voltage on an electrically isolated telecommunication line at a reference level. |
| 05/06/1986 | CA1204239A1 Borsht/slic auto balancing technique |
| 04/29/1986 | US4586119 Off-line switching mode power supply |
| 04/29/1986 | US4585905 Overvoltage protection circuit for SLIC |
| 04/23/1986 | EP0178993A2 Front end circuit structure for a subscriber line circuit interface |
| 04/23/1986 | EP0178992A2 A dual voltage source feed circuit configuration for a telephone line circuit |
| 04/22/1986 | US4584576 Ringing signal generator |
| 04/08/1986 | US4581691 Balanced constant current sensing circuit inherently immune to longitudinal currents |
| 04/08/1986 | US4581487 Universal DC feed for telephone line and trunk circuits |
| 04/01/1986 | CA1202741A1 Ringing signal generator employing delta modulation power amplification techniques |
| 04/01/1986 | CA1202739A1 Method and circuitry for encoding telephone ringing signals |
| 03/25/1986 | US4578542 Line powered flasher circuit for ringing signal |
| 03/25/1986 | US4578541 Telephone line interface circuit |
| 03/18/1986 | US4577064 Auto-balance circuit for battery feed in a telephone circuit |
| 03/11/1986 | US4575585 Synchronous programmable signal generator and method |
| 03/11/1986 | CA1201833A1 Transmission circuit for an electronic telephone set |
| 02/25/1986 | US4572927 Current limiter for telephone office signalling |
| 02/25/1986 | CA1201230A1 Floating battery feed circuit for telephone subscriber line interface |
| 02/25/1986 | CA1201229A1 Ground start detection in telephone loop signalling circuit |
| 02/25/1986 | CA1201228A1 Detection of ground or loop start configuration in telephone loop signalling circuit |
| 02/25/1986 | CA1201181A1 Start-up circuit for negative inductance multiplier |
| 02/25/1986 | CA1201180A1 Negative inductance multiplier circuit including temperature compensation |
| 02/19/1986 | EP0171692A2 Subscriber line circuit |
| 02/18/1986 | US4571462 Multiple use digital tone generator in telephone |
| 02/18/1986 | US4571460 Active impedance line feed circuit with improved ground fault protection |
| 02/18/1986 | CA1200938A1 Voice and data interface circuit |
| 02/04/1986 | CA1200335A1 Active impedance line feed circuit |
| 01/29/1986 | EP0169791A2 Music on hold for key systems and pabx systems |
| 01/29/1986 | EP0169706A2 Electronic battery feed circuit for telephone systems |
| 01/29/1986 | EP0169696A2 Battery feed system |
| 01/29/1986 | EP0169584A1 Circuit for electrically powering devices in a subscriber set |
| 01/28/1986 | US4567333 Electronic tone ringer with distinctive signaling circuitry |
| 01/28/1986 | US4567331 Electronic hybrid having synthesized impedance circuitry |
| 01/28/1986 | CA1200035A1 Apparatus for controlling the application of telephone line power in a telephone set |
| 01/15/1986 | EP0168318A2 A line circuit for supplying a loop current to a two-wire telephone subscriber line |
| 01/14/1986 | US4564726 Pulse/direct current transmitting circuit in a key telephone system |
| 01/08/1986 | EP0167346A2 Current characteristic shaper |
| 01/08/1986 | EP0166810A2 Method and apparatus for the generation of dialing tones |
| 12/31/1985 | US4562525 DC Power supply circuit for line interface circuits |