Patents
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Patents for H04Q 3 - Selecting arrangements (38,975)
01/1979
01/16/1979CA1046595A1 Cross-point switch matrix and multistage switching network using the same
01/09/1979US4133986 Subscriber's line equipment for a telephone exchange
01/02/1979US4132868 PABX System providing multiple paths held between calling line circuits and a plurality of output circuits
01/02/1979US4132865 Electronic switch
01/02/1979US4132860 Hold control for a key telephone system
01/02/1979CA1045705A1 Network path test circuit
12/1978
12/26/1978CA1045233A1 Arrangement for alternately assigning a marker to two translator assigners of an automatic common control switching system
12/26/1978CA1045231A1 Network routing and control arrangement
12/19/1978CA1044790A1 Intercept arrangement for key telephone systems
12/19/1978CA1044787A1 Dynamic speed of answer recorder
12/12/1978CA1044389A1 Key telephone privacy circuit
12/12/1978CA1044314A1 Coupling circuit for providing bilateral protection from hazardous voltages
12/05/1978US4128742 Rugged crosspoints for communication systems
12/05/1978US4128741 Electronic crosspoint array
11/1978
11/28/1978US4127745 Date time-multiplex switching network for use in a telecommunications exchange
11/28/1978US4127742 Time division telecommunication system
11/14/1978US4125855 Integrated semiconductor crosspoint arrangement
11/14/1978US4125748 Communication system call transfer arrangement
11/14/1978CA1042533A1 Automatic gain compensation in time division switching system
10/1978
10/31/1978US4123624 Switching network for a PCM TDM system
10/31/1978CA1041671A1 Serial digital bit stream code detector
10/31/1978CA1041670A1 Scanner diagnostic arrangement
10/24/1978US4122310 Space stage in a PCM-exchange
10/24/1978CA1041204A1 Current-operated circuits
10/24/1978CA1041203A1 Idle/busy status detector for a telephone switching network
10/24/1978CA1041202A1 Arrangement for increasing the call handling capabilities of a crosspoint tandem system
10/24/1978CA1041200A1 Automatic number identification having four-party detection
10/17/1978CA1040732A1 Thyristor circuitry for providing automatic number identification services
10/10/1978US4119806 Subscriber's line equipment for a telephone exchange
10/10/1978US4119805 Line-control unit for telecommunication system
10/10/1978CA1040293A1 Relay matrix for selector networks
10/03/1978US4118603 DC signaling circuit for use in conjunction with isolation transformers
10/03/1978CA1039867A1 System for addressed timemultiplexed telecommunication
10/03/1978CA1039837A1 Trunk circuit for crossbar switching systems
10/03/1978CA1039836A1 Method and apparatus for fault testing multiple stage networks
10/03/1978CA1039816A1 Method and apparatus for positioning nuts to be welded to a base
09/1978
09/26/1978US4117274 Key telephone privacy circuit
09/26/1978US4117270 Telephone answering and call diverting system
09/26/1978CA1039413A1 Shift and rotate circuit for a data processor
09/26/1978CA1039393A1 Matrix module and switching network
09/26/1978CA1039392A1 Automatic calling line identification arrangement
09/19/1978US4115866 Data processing network for communications switching system
09/19/1978US4115664 Discriminating network for telephone switching signals
09/12/1978US4114143 Modular switching system
09/12/1978US4113989 Electronic telephone system featuring switching networks having thyristors for single-wire switching
09/12/1978US4113988 Speech path packaging unit including controller containing shift register
09/12/1978CA1038482A1 Arrangement for handling permanent signals
09/05/1978US4112260 AC type line concentrator
09/05/1978US4112258 Communication system using intelligent network processor
09/05/1978CA1038068A1 Semiconductor channel switch
08/1978
08/29/1978US4110636 Feeding bridge
08/29/1978US4110566 Switching network control arrangement
08/29/1978US4110565 Duplex telephone signalling system
08/29/1978CA1037597A1 Switching system for multichannel lines
08/29/1978CA1037569A1 Switch turn off circuitry for semiconductor bridge
08/22/1978US4109113 Communication system optimized pooled line arrangement
08/15/1978US4107475 Receiver apparatus for detection of two voice frequencies in a multifrequency tone signal
08/15/1978US4107474 Bipolar transistor switching network crosspoint
08/15/1978US4107472 Semiconductor channel switch
08/08/1978US4105876 Electronic telephone system featuring periodic scanning of all peripheral units and polling of specific peripheral units for transmission of status and/or instruction information
08/08/1978US4105875 Electronic telephone switching system comprising a speech-path switching matrix and tone-connecting matrix and employing electronic crosspoint switching devices
08/08/1978US4105874 Centrally controlled electronic telephone system having a customer memory for storing information on two or more different subscriber stations and peripheral equipment-specific information
08/08/1978US4105873 Electronic telephone switching system comprising a speech path switching matrix and tone-connecting switching matrix and employing electronic crosspoint switches
08/08/1978US4105872 Electronic telephone system including interexchange trunk repeaters for traffic with other systems
08/08/1978US4105871 Electronic telephone system featuring a customer memory within a central control unit connected by bus lines
08/01/1978US4103988 Electrically controlled optical switch
07/1978
07/25/1978US4103113 Attendant console control system
07/11/1978US4100375 Telephone, intercom and remote control system
07/04/1978US4099241 Apparatus for facilitating a cooperation between an executive computer and a reserve computer
07/04/1978US4099235 Method of operating a data processing system
06/1978
06/27/1978US4097693 Switching system for an automatic telecommunication exchange with a plurality of intermediate lines that are grounded when not in use
06/20/1978US4096566 Modular signal processor having a hierarchical structure
06/20/1978US4096399 Crosspoint bias circuit arrangement
06/20/1978US4096362 Automatic cable balancing network
06/20/1978US4096358 Key telephone system signal priority arrangement
06/13/1978US4095055 Multi-stage switching network in a telecommunication switching system
06/13/1978US4095054 Electronic telephone switching system of the stored program type comprising two active stages and one passive stage
06/06/1978US4093942 Matrix circuits
06/06/1978US4093828 Switching networks, e.g. space-division concentrators
06/06/1978US4093827 Symmetrical time division matrix and a network equipped with this kind of matrix
06/06/1978US4093826 Tone signaling conversion apparatus
06/06/1978US4093819 Closed user group facility
05/1978
05/30/1978US4092497 Connection network for PCM TDM automatic telephone exchange equipment
05/30/1978US4092489 Switching arrangement for monitoring polarity reversal on lines in telecommunication systems
05/23/1978US4091359 Modular logic circuit utilizing charge-storage transistors
05/09/1978US4088845 Relay matrix switch
05/09/1978US4088844 Telephone station set interface circuit
05/09/1978US4088843 Electronic current feed circuit
05/09/1978US4088841 Telecommunication systems with captive condition surveillance and release
05/09/1978US4088840 Electronic cross-point matrix telephone private switching equipment
05/02/1978US4087649 Pulse counting circuit
05/02/1978US4087647 Circuit for supplying direct current to telephone station sets
05/02/1978US4087646 Dual mode telephone subscriber loop current detector
05/02/1978US4087645 Telephone switching system
05/02/1978US4087643 Time division multiplexed PABX communication switching system
04/1978
04/25/1978US4086438 Automatic interconnection system
04/18/1978US4085294 Control point driver circuit
04/04/1978US4082924 Reference signal circuit in a receiver for detecting two frequencies in a multifrequency tone signal
04/04/1978US4082923 Semiconductor speech path switch
03/1978
03/28/1978US4081792 Monolithically integrated semiconductor circuit arrangement
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