| Patents for H04Q 3 - Selecting arrangements (38,975) |
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| 10/23/1979 | US4172215 Transformer coupling circuit providing for cancellation of D.C. fluxes |
| 10/23/1979 | CA1065073A1 Multiple link circuit for a port multiplexer |
| 10/23/1979 | CA1065071A1 Telephone station make-busy circuit |
| 10/23/1979 | CA1065037A1 Telephone switching system having automated call hold facilities |
| 10/16/1979 | CA1064633A1 Receiver apparatus for detection of two voice frequencies in a multifrequency tone signal |
| 10/16/1979 | CA1064600A1 Digital switching for pabx telephone communication systems |
| 10/09/1979 | US4170740 High voltage switch and capacitive drive |
| 10/09/1979 | CA1064110A1 Wired broadcasting systems |
| 10/02/1979 | CA1063743A1 Telephone line loop-detecting circuits |
| 10/02/1979 | CA1063705A1 Central processor for a telephone exchange |
| 10/02/1979 | CA1063704A1 Closed user group facility |
| 09/25/1979 | US4169221 Method and apparatus for testing a subscriber line group marker of a telephone central office cross bar switching device |
| 09/18/1979 | US4168403 Key telephone system comprising only one control lead per outside line |
| 09/18/1979 | US4168402 Electronic trunk selector |
| 09/18/1979 | CA1062823A1 Electronic current feed circuit |
| 09/18/1979 | CA1062822A1 Direct station selection hold arrangement |
| 09/18/1979 | CA1062798A1 Connexion network for tdm-pcm automatic switching circuit |
| 09/11/1979 | US4167656 Junctor checking system |
| 09/11/1979 | CA1062354A1 Telephone station identification system |
| 09/06/1979 | WO1979000648A1 Telephone system with a plurality of internal extensions and a plurality of outside lines |
| 09/05/1979 | EP0003744A1 Central memory composed of differing types of memories |
| 09/04/1979 | US4166929 Interoffice callback arrangement |
| 08/28/1979 | US4165949 High efficiency split flow turbine for compressible fluids |
| 08/28/1979 | CA1061488A1 Control circuitry for key telephone apparatus |
| 08/28/1979 | CA1061440A1 Call processing restoration arrangement for telephone switching system |
| 08/22/1979 | EP0003504A1 Central condition memory for telephone exchanges |
| 08/14/1979 | US4164632 Signalling system for overvoltage protectors |
| 08/14/1979 | US4164627 Time division switching network using time slot interchangers |
| 08/14/1979 | CA1060569A1 Electrically controlled optical switch |
| 08/08/1979 | EP0003448A1 Space-time division connection network |
| 07/31/1979 | US4163159 Attenuation-free electronic switch |
| 07/31/1979 | US4163124 Finite storage-time queue |
| 07/24/1979 | US4162377 Data base auto bill calling using CCIS direct signaling |
| 07/24/1979 | CA1059246A1 Holding circuit in a receiver for detecting two frequencies in a multifrequency tone signal |
| 07/17/1979 | US4161633 Subscriber line/trunk circuit |
| 07/17/1979 | US4161630 Circuit arrangement for use in telephone systems |
| 07/03/1979 | US4160131 Electronic key telephone system |
| 07/03/1979 | US4160129 Telephone communications control system having a plurality of remote switching units |
| 07/03/1979 | CA1057870A1 Telephone control system for preventing unauthorized calls |
| 07/03/1979 | CA1057838A1 Cross-point switch matrix and multi-switching network using the same |
| 06/13/1979 | EP0002249A1 Circuit for time checking the duration of busy conditions in telephone exchanges |
| 06/12/1979 | US4158170 Line current detector |
| 06/12/1979 | US4158109 Interference insensitive line supervision circuit |
| 06/05/1979 | CA1056039A1 Method for through connection check in digital data systems |
| 05/29/1979 | US4156799 Automatic disconnect circuit |
| 05/22/1979 | US4156153 Electronic switch |
| 05/22/1979 | US4156114 Telephone network for verifying operator-initiated calls |
| 05/22/1979 | US4156113 Programmable data processor for use in small and medium-size switching systems, especially in telephone exchanges |
| 05/22/1979 | CA1055162A1 Arrangement for switching of data |
| 05/17/1979 | WO1979000254A1 Communication system optimized pooled line arrangement |
| 05/17/1979 | WO1979000253A1 Communication system conferencing arrangement |
| 05/17/1979 | WO1979000252A1 Communication system call transfer arrangement |
| 05/17/1979 | WO1979000250A1 Communication system call coverage arrangements |
| 05/16/1979 | EP0001783A1 Coupling field in a selecting system |
| 05/08/1979 | US4153818 Telephone multiline signaling using common signal pair |
| 05/08/1979 | US4153329 Optical crosspoint switch having mode-conversion facilities |
| 05/01/1979 | US4152549 Suppressor of spurious ringing currents for telephone apparatus |
| 05/01/1979 | CA1053783A1 Telecommunication system including non-symmetric switching network |
| 04/24/1979 | US4151375 System for selectively shifting groups of bits for temporary storage in a processor memory of a telephone exchange |
| 04/24/1979 | US4151374 Bus connection detector circuit for bus connection matrix circuit |
| 04/24/1979 | CA1053392A1 telephone connector interconnectingtwo automatic exchanges |
| 04/24/1979 | CA1053352A1 Method for providing a substitute memory module in a data processing system |
| 04/18/1979 | EP0001522A1 Electronic line equipment with two-wire-four-wire conversion circuit for telephone exchange |
| 04/17/1979 | US4150259 Communication system conferencing arrangement |
| 04/17/1979 | US4150257 Communication system call coverage arrangements |
| 04/10/1979 | US4149041 Telephone apparatus |
| 04/10/1979 | CA1052472A1 Data processing circuit operating on byte-by-byte basis |
| 04/10/1979 | CA1052463A1 Spc telecommunication system |
| 04/05/1979 | WO1979000158A1 Electronic equipment for users,with two wires-four wires conversion circuit for a telephone switch center |
| 04/03/1979 | US4147902 Method of automatic trunk testing |
| 04/03/1979 | US4147897 Circuit for telephone auxiliary exchanges having delayed connection of a busy signal set |
| 03/27/1979 | US4146752 Seizing current delay circuit for the test switching means of a telecommunication switching system |
| 03/27/1979 | US4146749 Telecommunications network having multi-function spare network block |
| 03/27/1979 | US4146748 Switching arrangement for pulse code modulation time division switching systems |
| 03/22/1979 | WO1979000138A1 Integrated switching and transmission network |
| 03/13/1979 | US4144406 Time-multiplex modular switching network for automatic exchange |
| 03/13/1979 | CA1050639A1 Collecting switching system call billing data |
| 03/07/1979 | EP0000990A1 Unbalanced/balanced converter circuits |
| 03/06/1979 | CA1050142A1 Pbx automatic number identification system |
| 02/27/1979 | US4142075 Interface circuit and method for telephone extension lines |
| 02/27/1979 | CA1049671A1 Key telephone system intercom arrangement |
| 02/27/1979 | CA1049638A1 Return answer supervisory circuit |
| 02/20/1979 | US4140885 Modular interchange termination system |
| 02/20/1979 | US4140879 Control circuit for transfer of auxiliary telephone equipment |
| 02/13/1979 | US4139739 Telecommunications call back system |
| 02/13/1979 | CA1048628A1 interface and control system for telecommunication center |
| 02/13/1979 | CA1048627A1 Multi station telephone switching system |
| 02/07/1979 | EP0000647A1 Optical crosspoint switch |
| 02/06/1979 | CA1048133A1 Programme-controlled data switching systems |
| 01/30/1979 | CA1047659A1 Active hybrid circuit |
| 01/30/1979 | CA1047635A1 Semiconductor speech channel switch |
| 01/30/1979 | CA1047634A1 Gate triggering method and system for speech channel switches |
| 01/23/1979 | US4136356 Wiring substrate for a matrix circuit |
| 01/23/1979 | US4136264 Private automatic branch exchange having two exchange units |
| 01/23/1979 | US4136263 Telephone system having space divided speech channels and a separate time divided data highway |
| 01/23/1979 | CA1047148A1 Tone injection circuit |
| 01/23/1979 | CA1047147A1 Electronic exchange system |
| 01/16/1979 | US4135062 Electric network for use in a subscriber's loop |
| 01/16/1979 | US4135061 Device for blocking a junctor of an automatic switching system |
| 01/16/1979 | CA1046616A1 Remote diagnostic apparatus |