Patents
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Patents for H04Q 3 - Selecting arrangements (38,975)
11/1981
11/24/1981CA1113189A1 Apparatus for reducing the instruction execution time in a computer employing indirect addressing of a data memory
11/18/1981EP0039948A1 PCM switching element
11/17/1981US4301334 Telecommunication subscriber line access circuit with ground key and insulation fault indication
11/17/1981CA1112746A1 Digital switching system with central control and interface unit
11/17/1981CA1112745A1 Digital switching system with time-space-time stages
11/10/1981CA1112344A1 Digital switching system with central control unit and data reformatter section
11/04/1981EP0039077A1 Time-division switching network
11/03/1981US4298774 Call waiting signal arrangement
10/1981
10/27/1981US4297536 Self-adjusting hybrid network
10/27/1981US4297532 Interfacing circuit status detection arrangement in a telephone exchange
10/27/1981US4297531 Circuit for suppressing noise influences in the evaluation of signal states on transmission lines
10/27/1981CA1111587A1 Circuit for supplying direct current to telephone station sets
10/27/1981CA1111584A1 Hold control for a key telephone system
10/21/1981EP0038147A1 Improvements in or relating to computer control systems
10/21/1981EP0037882A1 Multi-stage coupling field
10/20/1981US4296281 Static, solid state originating register compatible with an electromechanical telephone cross-bar switching system
10/14/1981EP0037499A2 Device interfacing a microprocessor bus and a synchronous periphery of sensors and drivers
10/13/1981US4295007 Line identifier for switchboards
10/13/1981CA1110746A1 Finite storage-time queue
10/07/1981EP0036979A1 Signalling process for telecommunication exchanges, especially telephone exchanges
10/06/1981US4293739 Circuit with crosstalk elimination capability
10/06/1981US4293735 Nodal structure switching network
10/06/1981CA1110331A1 Gate turn off thyristor switching circuit
09/1981
09/30/1981EP0036808A1 Communication system concentrator for connecting a plurality of asynchronous terminals
09/30/1981EP0036807A1 Communication system concentrator for connecting a plurality of asynchronous terminals
09/29/1981US4292476 Speech channel switching networks suitable for use in combination with electronic key telephone sets
09/23/1981EP0036223A1 Circuit for use in a telephone set
09/22/1981US4291199 Communication system tracking arrangement
09/16/1981EP0035546A1 Peripheral unit controller.
09/15/1981US4289934 Integrated automatic call distribution facility and PBX system
09/15/1981CA1109172A1 Supply circuit for a subscriber's line circuit
09/15/1981CA1109171A1 Supply arrangement for a line circuit
09/08/1981CA1108736A1 Switching matrix
09/01/1981US4287567 High speed central office scanner
09/01/1981US4287392 Integrated circuitry for exchanging signals between telephone station and central office
09/01/1981US4287387 Teletypewriter loop switching matrix
08/1981
08/28/1981EP0026187A4 Communication system tracking arrangement.
08/25/1981US4286171 Optoelectric cross-point switch
08/25/1981US4286118 Data distribution system for private automatic branch exchange
08/25/1981CA1107850A1 Modular switching system
08/18/1981US4285037 Circuit arrangement for a switching system
08/18/1981US4284853 Telecommunication subscriber line access circuit with ground key indication and a device for call signal generation
08/18/1981US4284852 Alternate routing for a telephone system
08/12/1981EP0033451A1 Circuitry for telecommunication exchanges, especially telephone exchanges, with memories for control orders
08/11/1981US4283603 On-hook/off-hook status check circuit
08/11/1981CA1106949A1 Electronic telephone switching system comprising a speech-path switching matrix and tone-connecting matrix and employing electronic crosspoint switching devices
08/11/1981CA1106948A1 Electronic telephone switching system comprising a speech-path switching matrix and tone-connecting matrix and employing electronic crosspoint switching devices
08/04/1981US4282408 On-hook/off-hook detector circuit
08/04/1981US4282407 Telephone loop resistance detector
07/1981
07/29/1981EP0032741A1 Circuit for transmitting signals to and from a subscriber of a private telephone branch exchange
07/29/1981EP0032677A1 Process for supervising occupied devices in a telecommunication exchange, especially in a telephone exchange
07/28/1981US4281219 Telephone line circuit
07/23/1981WO1981002082A1 Method of automatic switching in a communication network and switching centre therefor
07/22/1981EP0032410A1 Telephonic betting system for lotto or other authorized games of chance
07/21/1981US4280217 Time division switching system control arrangement
07/21/1981CA1105602A1 Optical crosspoint switch having mode-conversion facilities
07/14/1981US4278849 Test arrangement for automatic number identification systems
07/14/1981US4278843 Two-way amplifier arrangement
07/14/1981US4278842 Circuit for eliminating spurious pulses in a dial pulse stream
07/14/1981CA1105149A1 Arrangement in a stored program controlled telecommunication equipment
07/07/1981US4277649 Method and apparatus for screening telephone calls
07/07/1981US4277648 Telephone monitoring apparatus
06/1981
06/30/1981US4276639 Telephone exchange with time shared speech paths and selectively attenuated speech signals
06/30/1981US4276637 Time-division switching network and means of mitigating the effect of fault conditions
06/30/1981US4276611 Device for the control of data flows
06/30/1981US4276447 Signal processing apparatus for subscriber circuits
06/23/1981US4275277 Subscriber line interface circuit for a telephone line
06/23/1981CA1103792A1 Telecommunications network having multi-function spare network block
06/16/1981US4274112 Switching matrix for selectively connecting incoming signals to desired output paths
06/16/1981CA1103340A1 Time division telecommunications system
06/03/1981EP0029547A1 Process for individually controlling units of a group of units of a telecommunication system, especially of a telephone system
05/1981
05/26/1981CA1101972A1 Switching network control arrangement
05/26/1981CA1101971A1 Trunk control system
05/26/1981CA1101942A1 Bipolar transistor switch
05/19/1981CA1101572A1 Communication system optimized pooled line arrangement
05/19/1981CA1101564A1 Low crosstalk type switching matrix of monolithic semiconductor device
05/19/1981CA1101531A1 Continuously expandable switching network
05/19/1981CA1101530A1 Distributed control for switching system
05/13/1981EP0028416A1 Broadband switching system
05/13/1981EP0028415A1 Broadband coupling arrangement
05/05/1981US4266213 Circuit arrangement for an input keyboard
05/05/1981US4266101 Control circuit for a telephone system for the control of visual and audible signals
05/05/1981US4266100 Monolithically integrated semiconductor circuit
04/1981
04/28/1981US4264895 Multi-stage switching network controlled by at least three logical inputs
04/22/1981EP0027410A1 Switching method for time division multiplex signals transmitted by a carrier wave, particularly an optical wave, and device for putting it into use
04/22/1981EP0027226A1 Testing system for a connection network
04/16/1981WO1981001090A1 Telephone loop resistance detector
04/15/1981EP0027042A2 A network connection system
04/14/1981US4262331 Self-adaptive computer load control
04/14/1981US4262171 Telephone system in which communication between stations is controlled by computers at each individual station
04/08/1981EP0026413A1 Circuit arrangement for registering the switching state in a circuit especially constituted by subscriber lines in telephone exchanges
04/08/1981EP0026412A1 Circuit arrangement to avoid the adverse effect of the share of alternating tension during the registration of the switching state in a circuit especially constituted by subscriber lines in telephone exchanges
04/08/1981EP0026411A1 Circuit arrangement for determining the switching state of a subscriber line in telephone exchanges
04/08/1981EP0026187A1 Communication system tracking arrangement.
04/07/1981US4260857 Office line connection circuit during service interruptions in key telephone apparatus
04/02/1981WO1981000925A1 Peripheral unit controller
04/01/1981EP0026165A1 Private automatic branch exchange (PABX) with interception facility
04/01/1981EP0026020A1 Telephone set
03/1981
03/31/1981US4259549 Dialed number to function translator for telecommunications switching system control complex
03/24/1981US4258434 Bit-by-bit time-division digital switching network
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