| Patents for H04M 1 - Substation equipment, e.g. for use by subscribers (168,223) |
|---|
| 02/26/1980 | CA1072698A2 Electronic telephone network |
| 02/21/1980 | WO1980000289A1 Selectively controlled digital pad |
| 02/19/1980 | US4189626 Electronic tone ringer for telephone sets |
| 02/19/1980 | US4189623 Telephone answering device having simplified mechanical controls |
| 02/12/1980 | US4188512 Telephone hookswitch actuator and handset support assembly |
| 02/12/1980 | US4188508 Telephone call restricting apparatus |
| 02/12/1980 | US4188507 Remotely controlled telephone answering apparatus |
| 02/12/1980 | US4188506 Method and installation for masked speech transmission over a telephone channel |
| 02/12/1980 | US4188082 Telephone wall jack |
| 02/05/1980 | US4187404 Telephone set for optical fibers lines |
| 02/05/1980 | US4187403 Voice-protected, frequency-selective signal receiver |
| 02/05/1980 | US4187397 Device for and method of generating an artificial speech signal |
| 01/29/1980 | US4186283 Test set |
| 01/29/1980 | US4186279 Stored program telephone dialer |
| 01/29/1980 | CA1070838A1 Digital multitone generator for telephone dialing |
| 01/22/1980 | US4185175 Cushioned extension for telephone earpiece |
| 01/22/1980 | CA1070430A1 Method and apparatus for generating digital dual frequency signals |
| 01/15/1980 | US4184053 Ringing signal detector |
| 01/10/1980 | WO1980000052A1 Telephone with long distance dialing lockout |
| 01/09/1980 | EP0006265A1 Circuit for telephone sets detecting the dialling pulses |
| 01/08/1980 | US4182938 Telephone supporting set |
| 01/08/1980 | CA1069634A1 Hold circuit for telephone |
| 01/01/1980 | US4181818 Personal amplifier system |
| 01/01/1980 | CA1069233A Telephone hand set transmitter with improved output response |
| 01/01/1980 | CA1069232A Loop extender |
| 12/27/1979 | WO1979001145A1 Monitoring device for monitoring telephone calls coming through a subscriber station |
| 12/25/1979 | CA1068835A Voltage boost circuit for telephone systems |
| 12/18/1979 | US4179591 Telephone cover |
| 12/18/1979 | US4179590 Apparatus for controlling related equipment and for enabling hand free usage |
| 12/18/1979 | US4179588 Encoder unit for mobile radio transmitter |
| 12/18/1979 | CA1068425A1 Telephone ring detector circuit |
| 12/18/1979 | CA1068406A1 Spoken message transmission device |
| 12/11/1979 | US4178490 Tamperproof handset for railroad applications |
| 12/11/1979 | US4178488 Telephone set |
| 12/11/1979 | US4178487 Switch selector and actuator |
| 12/11/1979 | US4178484 Long line telephone system with an amplifying substation |
| 12/11/1979 | US4178477 Telephone Recorder mechanical actuator |
| 12/04/1979 | US4177362 Tamperproof handset connector arrangement for railroad applications |
| 12/04/1979 | US4177361 Signaling tone transparent echo suppressor |
| 12/04/1979 | US4177358 Tone dial toll restrictor |
| 12/04/1979 | CA1067634A1 Line circuit for key telephone systems |
| 12/04/1979 | CA1067633A1 Key telephone system interconnection apparatus |
| 11/27/1979 | US4176255 Adjustable impedance battery feed circuit |
| 11/20/1979 | US4175217 Telephone headset |
| 11/20/1979 | US4175216 Intercom calling apparatus in a key telephone system |
| 11/20/1979 | CA1066826A2 Automatic h-register clear for prevention of erroneous convolution in digital adaptive echo canceller |
| 11/14/1979 | EP0005256A2 Remote control for radiocommunication devices |
| 11/14/1979 | EP0005175A1 Key selector |
| 11/06/1979 | US4173736 Capacitance detecting system and method for testing wire connections |
| 10/31/1979 | EP0004901A2 Circuit for subscriber stations with selecting means and current supply over the lines in telecommunication systems, especially telephone systems |
| 10/31/1979 | EP0004867A1 Circuit arrangement for subscriber sets in private branch exchanges with tone pushbutton dialling |
| 10/30/1979 | US4172969 Real time absentee telephone and radiant wave signaling system |
| 10/18/1979 | WO1979000824A1 A connection arrangement in a telephone instrument for connecting an additional speech device |
| 10/17/1979 | EP0004709A1 Improvements in or relating to input circuits for telephone answering machines |
| 10/16/1979 | CA1064634A1 Telephone instruments |
| 10/09/1979 | CA1064172A1 Apparatus for suppressing background noise in a digital telephone system |
| 09/25/1979 | US4169220 Telephone instrument connection block with remotely actuated line test |
| 09/25/1979 | US4169218 Flat panel telephone station set |
| 09/25/1979 | US4169217 Line status apparatus for telephones |
| 09/25/1979 | US4169216 Electronic hold and hold-release circuit for a telephone set in a multiple extension single line telephone system |
| 09/25/1979 | US4169215 Signal limiting circuit |
| 09/25/1979 | CA1063273A1 Telephone control apparatus |
| 09/25/1979 | CA1063270A1 Remote data line monitor |
| 09/18/1979 | US4167827 Telephone set with rotary dial |
| 09/11/1979 | US4167655 Push button to rotary dial converter systems |
| 09/11/1979 | US4167223 Mechanically operable acoustic filter |
| 09/06/1979 | WO1979000648A1 Telephone system with a plurality of internal extensions and a plurality of outside lines |
| 08/28/1979 | CA1061491A1 Electronic telephone network |
| 08/22/1979 | EP0003512A1 Phone guard for locking out long-distance calls |
| 08/21/1979 | US4165451 Note pad supports for desk telephones |
| 08/21/1979 | US4165445 Circuit for preventing acoustic feedback |
| 08/21/1979 | US4165053 Cable drum for automatic rewinding of a cable |
| 08/14/1979 | US4164663 Sequential control signal generator |
| 08/14/1979 | US4164630 Combined telephone index and keyboard for dialer |
| 08/08/1979 | EP0003334A1 Keypad for telephone |
| 08/07/1979 | US4163883 Keyboard with illuminated keys |
| 08/07/1979 | US4163875 Telephone handset with transmitter having a one piece gasket for sealing and holding of transmitter members |
| 08/07/1979 | US4163874 Molded plastic base plate for a telephone set |
| 07/31/1979 | CA1059668A1 Multi-frequency generator using digital technique |
| 07/24/1979 | US4162374 Voice-switched telephone set |
| 07/24/1979 | US4162373 Flexible acoustic coupler |
| 07/17/1979 | US4161633 Subscriber line/trunk circuit |
| 07/17/1979 | US4161624 Hands-free telephone with cascaded attenuators |
| 07/10/1979 | US4160879 Telephone display accessory |
| 07/10/1979 | CA1058297A1 Telephone wall jack cover |
| 07/03/1979 | US4160136 Anti-vandalism arrangement for protecting the touch calling unit of a coin telephone |
| 07/03/1979 | US4160124 Multiple dial adapter |
| 07/03/1979 | US4160122 Telephone earphone amplifier |
| 07/03/1979 | CA1057870A1 Telephone control system for preventing unauthorized calls |
| 06/26/1979 | US4159403 Telephone set attachment for note holding |
| 06/26/1979 | CA1057436A1 Telephone extension system utilizing power line carrier signals |
| 06/26/1979 | CA1057385A1 Split cover plate for telephone outlet |
| 06/19/1979 | CA1056970A1 Electronic network for telephone set |
| 06/19/1979 | CA1056969A2 Programmable clock |
| 06/13/1979 | EP0002378A2 A control unit for establishing a four-wire link via a pair of telephone lines |
| 06/12/1979 | US4158106 Telephone handset acoustic coupling cup |
| 06/12/1979 | CA1056528A1 Variable impedance detecting circuit for a telephone line auxiliary device |
| 06/05/1979 | US4157459 Electronic audio signalling device for telephones |
| 06/05/1979 | CA1056077A1 Telephone mouthpiece keyboard |
| 05/31/1979 | WO1979000295A1 Current sources |