Patents
Sitemap › H04 - Electric communication technique › H04M - Telephonic communication › H04M 1 - Substation equipment, e.g. for use by subscribers
Patents for H04M 1 - Substation equipment, e.g. for use by subscribers (168,223)
10/1980
10/14/1980US4228320 Noise detector for frequency modulation systems
10/07/1980US4227053 Telephone answering device having balanced input
10/02/1980WO1980002094A1 Communication system tracking arrangement
10/02/1980WO1980002085A1 Connector with spare contact adapter provision
10/01/1980EP0016056A1 Telecommunications apparatus, e.g. a telephone, with long distance dialing lockout.
09/1980
09/30/1980US4225754 Loudspeaker telephone
09/30/1980CA1086881A1 Molded plastic base plate for a telephone set
09/23/1980US4224482 Mobile microphone-transmitter assembly
09/23/1980US4224478 Data transmission circuit for establishing a bidirectional data path in a telephone system
09/23/1980US4224465 Labyrinth path multiple cable holder with strain relief
09/23/1980CA1086438A1 Telephone line lifting apparatus
09/18/1980WO1980001975A1 Gain control circuit
09/16/1980US4223186 Circuit arrangement for line-supplied subscriber stations having dial devices
09/09/1980US4221933 Data storage and retrieval structure for a message storage system
09/09/1980US4221932 Infrared remote signaling system
09/09/1980CA1085524A1 Four-wire integrable hybrid
09/03/1980EP0014749A1 Retaining device for a housing detachably mounted onto a wall
09/02/1980US4220829 Telephone handset
09/02/1980US4220828 Telephone subset
09/02/1980US4220825 Telephone status monitor circit
09/02/1980US4220823 Selectively controlled digital pad
09/02/1980US4220820 Control circuitry for a radio telephone
09/02/1980CA1085076A1 Telephone set with rotary dial
08/1980
08/26/1980US4219700 Partyline subscriber interface circuit
08/26/1980CA1084614A1 Total service telephone answering system
08/19/1980US4218590 Key telephone system having automatic exclusion circuit for line privacy
08/19/1980CA1084186A1 Column and lever construction for a charactered telephone
08/12/1980CA1083737A1 Deformable base member for a telephone set
08/12/1980CA1083736A1 Line status apparatus for telephones
08/12/1980CA1083735A1 Control circuit for hands-free telephone
07/1980
07/29/1980CA1082828A1 Telephone set
07/23/1980EP0013430A1 Improvements in or relating to dial units for telephone sets
07/22/1980US4214132 Testing tools for modular telephone system
07/22/1980US4214130 Signal coupler
07/22/1980US4214127 Intrinsically safe telephone network
07/22/1980CA1082380A1 Telephone system for automatic redialing of busy numbers
07/15/1980US4213012 Discriminating means for telephone circuits
07/15/1980US4213010 Fail-safe mechanisms for a telephone answering device
07/15/1980US4213009 System of connecting a wire telecommunication and a radio communication
07/09/1980EP0012864A1 Telephone
07/08/1980US4211938 Tone detector
07/08/1980CA1081382A1 Telephone handset with transmitter having a one piece gasket for sealing and holding of transmitter members
07/08/1980CA1081381A1 Telephone handset with rotatably locking receiver
07/01/1980US4210787 Keyboard construction
07/01/1980CA1080869A1 Electronic hybrid and hybrid repeater
07/01/1980CA1080844A1 Personal audio listening system
06/1980
06/26/1980WO1980001349A1 Data storage and retrieval structure for a message storage system
06/25/1980EP0012247A1 Subscriber line circuit
06/24/1980US4209673 Automatic disinfectant apparatus for telephone handset
06/24/1980US4209671 Method and apparatus for testing the tip-ring polarity of telephone receptacles connected in parallel to a non-working pair
06/24/1980US4209668 Telephone having reiterative dialing feature
06/11/1980EP0011705A1 Microphone amplifier, in particular for telephone installations
06/03/1980US4206318 Intraplant communication system
06/03/1980CA1078968A1 Bidirectional data transfer and storage system
05/1980
05/28/1980EP0011063A1 Portable radiotelephone system
05/27/1980CA1078536A1 Bilateral voice-signal controller for use in the two-wire portion of the telephone circuit
05/27/1980CA1078522A1 Modular communication system having self-identifying modules
05/20/1980US4204097 Lockable covering apparatus for telephone dials
05/20/1980CA1078049A1 Automatic page
05/15/1980WO1980001027A1 Apparatus for driving laminated tape used for automatic answering telephone or the like
05/14/1980EP0011035A1 Automatic telephone dialling apparatus with microprocessor
05/13/1980US4203007 System for receiving remote control signal in automatic telephone answering device
05/13/1980US4203006 Direct access coupler
05/13/1980CA1077632A1 Method and apparatus for operation of carbon microphones at low average current levels
05/06/1980US4202038 Method of effecting one of several different circuit connections
05/06/1980US4201888 Remote playout telephone answering device
04/1980
04/29/1980CA1076688A1 Apparatus providing for the remote display of calling numbers in a telephone system
04/22/1980US4199794 Dual tape transport system with tensioning means
04/22/1980US4199666 Straight line telephone dialer
04/22/1980CA1076279A1 Key telephone adapter for electronic telephone switching system
04/17/1980WO1980000772A1 Device for supporting a receiver of a telephone,on a listening in position,without manual head
04/16/1980EP0009773A1 Method and circuit for discriminating between electric speech signals or the like and frequency constant tone signals
04/16/1980EP0009684A1 A telephone-switching system
04/15/1980US4198548 Telephone set with improved hook switch mechanism
04/15/1980US4198544 Tape head control arrangement
04/08/1980US4197526 Miniature pager receiver with digital display and memory
04/08/1980US4197426 Remote playout telephone answering device
04/02/1980EP0009295A1 Infrared light communication equipment
04/02/1980EP0009293A1 Circuit for connecting, at one time, only one of a number of telephone sets to a subscriber's line
04/02/1980EP0009127A1 Circuit for a line-fed loudspeaking telephone station
04/02/1980EP0009051A1 Telephone system with a plurality of internal extensions and a plurality of outside lines
04/01/1980US4196318 Electronically-switched multifrequency generator for providing tone signaling
04/01/1980US4196317 Telephone intercom system
04/01/1980US4196311 Binary-coded message communication
04/01/1980CA1074933A1 Apparatus for subscriber testing of a telephone line
03/1980
03/25/1980US4195207 Telephone push button switch assembly having sequential operated contact structure
03/25/1980CA1074473A2 Impedance simulating repeater for transmission lines
03/20/1980WO1980000517A1 Communication apparatus for the handicapped
03/18/1980US4194151 Multifrequency generator
03/18/1980US4194098 Lineman's hand test set
03/18/1980US4194089 Automatic answering telephone set having an endless tape with a plurality of selective tracks
03/11/1980US4192971 Remote-controllable automatic telephone answering device
03/11/1980US4192425 Telephone accessory
03/04/1980US4191861 Telephone amplifier
03/04/1980CA1073139A2 Repeater for transmission lines of differing lengths
03/04/1980CA1073138A2 Circuit for generating control signal indicative of transmission line resistance
03/04/1980CA1073136A1 Digital echo attenuator for telephone system
03/04/1980CA1073135A1 Line circuit for key telephone systems
03/04/1980CA1073134A1 Code-controlled detection and function actuating system
02/1980
02/26/1980US4190747 Signal corrected optocoupled device
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