Patents
Sitemap › H04 - Electric communication technique › H04Q - Selecting › H04Q 5 - Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange
Patents for H04Q 5 - Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange (6,717)
07/1989
07/11/1989US4847833 System for the simultaneous operation of a plurality of terminal equipment at a network terminating unit of a broadband network
07/05/1989EP0323083A1 Communication terminal apparatus
06/1989
06/27/1989CA1256616A1 Capacity expander for telephone line
05/1989
05/23/1989US4833692 Non-linear amplifier for digital network
04/1989
04/26/1989EP0312911A2 Apparatus and method for master/slave synchronization
03/1989
03/08/1989EP0306201A2 Receiver and method of operating same
01/1989
01/31/1989CA1249680A1 Selective ringing circuit for a telephone
01/10/1989US4797874 Circuit arrangement for the transmission of communication signals
12/1988
12/28/1988CN88103175A Non-cord telephonic system
11/1988
11/09/1988EP0289526A1 Adaptive threshold sampling method.
08/1988
08/02/1988US4761810 Programmable selective ringing circuit and method for party telephone line
08/02/1988CA1240084A1 Multi-party line emergency access device
07/1988
07/05/1988US4755994 Capacity expander for telephone line
06/1988
06/01/1988EP0269423A2 Local area network exchange
05/1988
05/11/1988CN87213566U Single channel carrier telephone terminal in city
04/1988
04/26/1988US4741024 Selective ringing circuit for a telephone
03/1988
03/10/1988WO1988001809A1 Adaptive threshold sampling controller
03/03/1988DE3628642A1 Circuit arrangement for a party line system (connection transfer device)
02/1988
02/24/1988EP0256027A1 Method for the simultaneous operation of several terminal equipments on one network termination unit of a broadband network.
01/1988
01/26/1988US4722082 ISDN subscriber terminal control system
01/07/1988EP0251986A2 Telephone line multiplication apparatus with improved ringing generator
12/1987
12/09/1987EP0248763A2 Circuit arrangement for a plurality of subscribers on a common line
12/02/1987EP0247964A2 Connection of terminal apparatuses to a common line
12/02/1987EP0247963A2 Method for the supervision of the function of telecommunication exchanges, especially industrial telephone exchanges with party lines
11/1987
11/11/1987EP0245025A2 Response system of a terminal to an incoming call
10/1987
10/28/1987CN86104723A Electroacoustic system with displaced acoustic source
10/20/1987US4701949 Frequency responsive party telephone line selection apparatus and method
09/1987
09/16/1987EP0236445A1 Capacity expander for telephone line
07/1987
07/02/1987WO1987004035A1 System for simultaneous operation of several terminals on a network terminating unit of a wide-band network
04/1987
04/21/1987US4660219 Extension ringing arrangement key telephone system
03/1987
03/24/1987US4653093 Frequency selective ringer circuit
03/24/1987US4653046 Single channel subscriber carrier system
03/12/1987WO1987001542A1 Capacity expander for telephone line
02/1987
02/24/1987US4645877 Interface for connecting standard telephones to party lines
02/04/1987EP0210941A2 Selective ringing circuit for a telephone
01/1987
01/31/1987CN85101387A Signal transmitting system of master-control telephone set
11/1986
11/20/1986EP0201734A1 Device at a telephone subscriber terminal for disconnecting one out of two alternately and automatically connectable substations by the exchange in case of an undesired loop closure in one of these substations
07/1986
07/02/1986EP0107696B1 Apparatus for connecting digital terminals to a digital exchange
05/1986
05/06/1986US4587380 Interface for connecting standard telephones to party lines
04/1986
04/01/1986CA1202740A1 Rural interface device
02/1986
02/25/1986CA1201231A1 Multiparty line adaptor with privacy feature
01/1986
01/28/1986US4567330 Interface for connecting standard telephones to party lines
11/1985
11/12/1985US4553235 Apparatus for connecting digital terminals to a digital exchange
10/1985
10/01/1985CA1194572A1 Apparatus for connecting digital terminals to a digital exchange
07/1985
07/09/1985US4528424 Multiparty line adapter with privacy feature controlled by reversal of line polarity at a central power source
05/1985
05/28/1985CA1187969A1 Digital loop transceiver for interfacing a digital pabx to a digital subscriber set via a subscriber line
02/1985
02/26/1985CA1183293A1 Four-pole limiting spurious signals for type 1 1 telephone transmission systems
01/1985
01/02/1985EP0129843A2 Multiparty line adaptor with privacy feature
07/1984
07/10/1984US4459433 Station identification circuit arrangement
07/03/1984CA1170380A1 Bridge lifter circuit
03/1984
03/06/1984US4435619 In a telephone system
02/1984
02/14/1984US4432089 Digital loop transceiver for interfacing a digital PABX to a digital subscriber set via a subscriber line
01/1984
01/24/1984CA1161177A1 Multiple line telephone instrument
11/1983
11/29/1983US4418245 Interference limiting two-port network for 1+1 type transmission systems
11/24/1983WO1983004115A1 Apparatus for connecting digital terminals to a digital exchange
09/1983
09/20/1983US4406004 Ring scheduling apparatus for a digital multiplexed telecommunication system
09/20/1983CA1154182A1 Telephone systems
08/1983
08/30/1983CA1153137A1 Parallel operation of telephone equipment on a digital loop
07/1983
07/07/1983WO1983002379A1 Digital loop transceiver for interfacing a digital pabx to a digital subscriber set via a subscriber line
06/1983
06/14/1983CA1148286A1 Calling device for subscriber automatic telephone installation with extension stations
06/14/1983CA1148240A1 Telephone exchange systems utilizing telephone sets
05/1983
05/25/1983EP0079566A1 Interference limiting quadrupole for telephone transmission systems of the 1+1 type
05/10/1983US4383137 Key telephone system with multiple processor control
04/1983
04/26/1983CA1145494A1 Ringing signal generator
03/1983
03/01/1983CA1142279A1 Ringing decoder circuit
02/1983
02/01/1983US4371756 Bridge lifter module
02/01/1983US4371755 Bridge lifter circuit
01/1983
01/11/1983US4368358 Loop sharing in digital systems
12/1982
12/08/1982EP0066011A1 Telecommunication system
09/1982
09/08/1982EP0059543A1 Parallel operation of telephone equipment on a digital loop
05/1982
05/12/1982EP0051495A1 Ring scheduling apparatus for a digital multiplexed telecommunication system
04/1982
04/27/1982US4327256 Telephone system
04/06/1982CA1121528A1 Miniature bridge lifter for telephone lines
02/1982
02/09/1982US4315110 Multiple line telephone instrument
01/1982
01/19/1982CA1116734A1 Subscriber drop-connected circuits
01/12/1982US4310728 Ringing device for a private automatic branch exchange
01/12/1982US4310723 Party line apparatus
01/05/1982CA1115867A1 Exclusion system for a key telephone system
11/1981
11/12/1981WO1981003251A1 Selective operation multi-party call telephone equipment and network
11/10/1981CA1112382A1 Communication circuit
10/1981
10/06/1981US4293737 Ringing decoder circuit
08/1981
08/04/1981US4282410 Ringing signal generator
06/1981
06/17/1981EP0030395A1 Emergency call installation
03/1981
03/24/1981US4258230 Party line telephone system
02/1981
02/04/1981EP0023403A1 A digital loop sharing communication system and a telephone instrument for use therein
01/1981
01/20/1981CA1094174A1 Sampling filter-detector
11/1980
11/12/1980EP0018844A1 Telephone systems
11/11/1980CA1089565A1 Card validation, method and system
10/1980
10/01/1980EP0016672A1 Call device for an automatic subscriber telephone installation with extensions
09/1980
09/09/1980US4221935 Control circuit for telephone subscriber station
06/1980
06/24/1980US4209667 Subscriber drop-connected circuits
04/1980
04/29/1980CA1076724A1 High voltage low frequency signal transmitter using a carrier current link
04/29/1980CA1076707A1 Electronic price display unit
04/08/1980US4197433 Device for conveying a high-voltage low-frequency signal over a carrier connection
04/02/1980EP0009293A1 Circuit for connecting, at one time, only one of a number of telephone sets to a subscriber's line
04/02/1980EP0009051A1 Telephone system with a plurality of internal extensions and a plurality of outside lines
11/1979
11/06/1979US4173714 Communication circuit with combined power feed and data transmission over a phantom channel
09/1979
09/25/1979US4169217 Line status apparatus for telephones
09/25/1979US4169216 Electronic hold and hold-release circuit for a telephone set in a multiple extension single line telephone system
09/18/1979US4168403 Key telephone system comprising only one control lead per outside line
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