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)
09/1981
09/29/1981US4291475 Labelling device
09/29/1981CA1109974A1 Push buttons
09/23/1981EP0036223A1 Circuit for use in a telephone set
09/23/1981EP0036005A1 Duplex amplifyer particularly for interphone
09/22/1981US4291411 Remote control for radiotelephones
09/22/1981US4291202 Telephone handset chassis and flexible printed circuit
09/22/1981US4291201 Push-button dial assembly for telephones
09/22/1981US4291199 Communication system tracking arrangement
09/22/1981US4291198 General-purpose electronic telephone station set
09/22/1981US4291197 Remote telephone system
09/22/1981CA1109575A1 Telephone set
09/17/1981WO1981002649A1 Electronic lock,switching and hold devices for telephones
09/16/1981EP0035590A1 Radio apparatus for a vehicle
09/15/1981US4289938 Voice amplification apparatus
09/15/1981US4289931 Security identification system using pulse code modulation
09/08/1981US4288663 Noise canceling transmitter
09/08/1981US4288661 Interface circuitry for acoustic coupler compensation
09/08/1981CA1108790A1 Integral telephone set and handset
09/08/1981CA1108788A1 Automatic dialer having a selective retry capability
09/08/1981CA1108787A1 Automatic dialer for facsimile terminals and the like
09/03/1981WO1981002481A1 Electronic repertory
09/02/1981EP0034843A2 Line interruption arrangement
09/02/1981EP0034613A1 Acoustic coupler cavity lineariser
09/01/1981CA1108326A1 Telephone set for optical fibers lines
08/1981
08/28/1981EP0026187A4 Communication system tracking arrangement.
08/25/1981US4286124 Arrangement for securing panels to a console
08/25/1981US4286123 Bridge amplifier
08/25/1981US4286120 Current regulated pulse dialer circuit
08/25/1981US4286113 Telephone system eavesdropping device
08/20/1981WO1981002373A1 Audio data transmission device
08/18/1981US4284855 Base for telephone set, for alternative desk and wall mounting
08/18/1981CA1107420A1 Apparatus and method for a multiple tone code sender system for automatic call initiation
08/11/1981US4283604 Current source circuits with common mode noise rejection
08/11/1981US4283603 On-hook/off-hook status check circuit
08/11/1981US4283037 Telephone display device
08/11/1981CA1106986A1 Telephone instrument connection block with remotely actuated line test
08/05/1981EP0033162A2 Digital tone ringer
08/04/1981US4282409 Speech networks for telephone sets
08/04/1981CA1106454A1 Photocoupling line isolation circuit
07/1981
07/29/1981EP0032533A1 Amplifier circuit
07/28/1981US4281220 Telephone dialing and answering device
07/28/1981CA1106089A1 Automatic dialling device
07/28/1981CA1106088A1 Digitally synthesized touch-tone audio signal generator
07/22/1981EP0032365A1 Supervision device for a digital signal generator
07/21/1981US4280025 Lockable cover assembly for push-button key pad
07/21/1981CA1105630A1 Electroacoustical telephone adapter for hands-free telephone
07/21/1981CA1105628A2 Subscriber line-trunk circuit
07/14/1981US4278845 Telephone index for automatic dialing
07/14/1981CA1105163A1 Amplifier for telephone handset
07/14/1981CA1104902A1 Telephone set with storing box
07/08/1981EP0031557A1 Apparatus for optical telephony
07/08/1981EP0031325A1 Selectively controlled digital pad
07/07/1981US4277652 Fastening arrangement in a telephone instrument
07/07/1981US4277651 Telephone dialer
07/01/1981EP0031210A1 Telephone attachment
06/1981
06/30/1981USRE30662 Communications headset with reversible mounting means
06/30/1981CA1104277A1 Electronic audio signalling device for telephones
06/24/1981EP0030739A1 Circuit for storing the energy of an applied signal for use in a telephone annunciator
06/24/1981EP0030708A1 Switching system with paging function
06/23/1981US4275273 Telephone index for repertory dialer
06/23/1981US4275266 Device to control machines by voice
06/23/1981CA1103823A1 Automatic dialer having a recall memory
06/16/1981US4273969 Communications headset mountable over the ear
06/16/1981US4273957 Telecommunications access apparatus
06/16/1981CA1103378A1 Fastening arrangement in a telephone instrument
06/10/1981EP0030228A2 Speech networks for telephone sets
06/09/1981US4272655 Compact telephone set employing slidable actuated supervision switches
06/09/1981US4272650 Power supply system
06/03/1981EP0029574A1 Keyboard dial for an automatic telephone apparatus using analogue techniques
06/02/1981US4271333 Pushbutton dial assembly
05/1981
05/28/1981WO1981001491A1 Subscriber telephone station
05/27/1981EP0029135A1 Impedance circuit with adjustable resistance value
05/27/1981EP0029134A1 Amplifier circuit of predeterminable AC internal resistance
05/26/1981CA1102026A1 Telephone set
05/20/1981EP0028688A1 Lay-out for transmitting control signals via a speech channel
05/19/1981US4268726 Multiple cantilever spring contact switch
05/19/1981US4268723 Circuits and methods for initializing the loop current of a telephone set
05/19/1981US4268721 Portable telephone communication device for the hearing impaired
05/19/1981US4268716 Audio teleconferencing
05/19/1981US4268109 Coupler for telephone cords
05/19/1981CA1101573A1 Automatic gain and return loss compensating line circuit
05/19/1981CA1101571A1 Automatic dialer with a programmable pause
05/13/1981EP0028229A1 A balanced amplifier output stage.
05/12/1981US4267409 Keyboard decade digital dial
05/12/1981CA1101142A1 Voice-switched telephone set
05/06/1981EP0027999A1 Telephon-handset for a radio apparatus for mobile use
05/06/1981EP0027833A1 Telephone substation
05/05/1981US4266102 Automatic dialing device
05/05/1981US4266098 Device to automatically screen incoming telephone calls, determine the identity of the caller and process the call accordingly
05/05/1981CA1100621A1 Artificial ear for telephonometric measurements
04/1981
04/29/1981EP0027596A1 Circuit arrangement for a telephone apparatus
04/28/1981US4264787 Hazardous voltage protection circuit
04/28/1981US4264785 Voltage regulator circuitry for a telephone answering device
04/28/1981CA1100205A2 System for interconnecting circuits in telephone signal equipment to circuits in a single telephone station
04/28/1981CA1100165A1 Pushbutton switch assembly for telecommunications and other input apparatus
04/22/1981EP0027302A1 Interface circuits for touch-pulse telephones
04/22/1981EP0027188A1 Hook switch for telephone apparatuses
04/22/1981EP0027170A1 Push button block
04/21/1981US4263556 Monostable system
04/21/1981US4263484 Microphone unit
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