| Patents for H04M 1 - Substation equipment, e.g. for use by subscribers (168,223) |
|---|
| 05/24/1983 | US4385385 Circuit for monitoring a digital signal generator |
| 05/24/1983 | US4385212 Expandable communication terminal housing |
| 05/24/1983 | US4385209 Adjustment of operating characteristics of a telephone transmitter including an electret transducer |
| 05/24/1983 | US4385207 Line powered transformerless loudspeaking telephone |
| 05/24/1983 | CA1147075A1 Compact telephone set employing slidable actuated supervision switches |
| 05/17/1983 | US4384260 Device for switching on and off and adjusting the volume of communications equipment, such as transceivers |
| 05/17/1983 | US4384171 Automatic telephone silencer |
| 05/17/1983 | CA1146685A1 Telephone cradle |
| 05/11/1983 | EP0078319A1 Telephone protective cover |
| 05/10/1983 | US4383140 Telephone receiver holding device |
| 05/10/1983 | US4383138 Method and apparatus for processing coded information received through a telephone line during the inter-ringing periods |
| 05/10/1983 | US4383137 Key telephone system with multiple processor control |
| 05/10/1983 | CA1146290A1 Hazardous voltage protection circuit |
| 05/10/1983 | CA1146289A1 Double talk detector for echo cancellers |
| 05/04/1983 | EP0078036A2 Key set for a communication equipment terminal |
| 05/03/1983 | US4382162 Calculator pushbutton format attachment for pushbutton telephones |
| 05/03/1983 | US4382161 Clip-on electronic switching and hold devices for telephones |
| 05/03/1983 | CA1145870A1 Lighted telephone dial |
| 04/28/1983 | WO1983001550A1 Snap-together housing |
| 04/27/1983 | EP0077360A1 Subscriber telephone set provided with protection devices against overvoltages. |
| 04/26/1983 | CA1145495A1 Current regulated pulse dialer circuit |
| 04/20/1983 | EP0077216A1 Radio system |
| 04/19/1983 | CA1145029A1 Communications headset mountable over the ear |
| 04/14/1983 | WO1983001361A1 Expandable communication terminal housing |
| 04/13/1983 | EP0076688A1 Telephone answering and message recording system |
| 04/13/1983 | EP0076646A1 Calling line tracing system and identification detector |
| 04/12/1983 | US4379953 Telephone switch retaining apparatus |
| 04/12/1983 | CA1144672A1 Telephone intruder alert system |
| 04/12/1983 | CA1144671A1 Central office interface circuit |
| 04/06/1983 | EP0076190A1 Chin-strap microphone unit for individually carrying a microphone |
| 04/05/1983 | CA1144204A1 Seal for a sliding actuator for a linear control member |
| 03/30/1983 | EP0075120A1 Automatic dialling device |
| 03/30/1983 | EP0074969A1 Device for communicating between users of a vehicle |
| 03/29/1983 | US4378603 Radiotelephone with hands-free operation |
| 03/29/1983 | US4378467 Audio amplifier |
| 03/23/1983 | EP0074940A1 Cordless telephone set |
| 03/23/1983 | EP0074617A1 Locking device for at least one dial key of a push-button telephone set |
| 03/22/1983 | CA1143496A1 Automatic restoral mechanism for a pushbutton key telephone instrument |
| 03/22/1983 | CA1143495A1 System for remote control of an automatic telephone answering machine |
| 03/16/1983 | EP0074319A2 Telephone set |
| 03/09/1983 | EP0073543A2 Information transmission system between a telephone set and a person at a distance from his set |
| 03/08/1983 | CA1142665A1 Wall mounting adaptor for telephone set |
| 03/08/1983 | CA1142664A1 Method of recording and reproducing a message with an indication of a time instance |
| 03/02/1983 | EP0072813A1 Hook switch for a telephone instrument of single body type |
| 03/01/1983 | US4375584 Modular telephone keyset structure |
| 03/01/1983 | US4375583 Indirectly activatable telephone system |
| 03/01/1983 | CA1142282A1 Telephone handset chassis and flexible printed circuit |
| 02/23/1983 | EP0072705A2 Amplifiers |
| 02/22/1983 | US4375015 Improved electronic hybrid circuit |
| 02/17/1983 | WO1983000592A1 Semiconductor crosspoint linearizing arrangement |
| 02/17/1983 | WO1983000588A1 Multi-tone signal generator |
| 02/16/1983 | EP0071936A2 Telephone interfaced recording and playback apparatus |
| 02/15/1983 | US4374301 Local external communication device for enclosed helmet and mask assembly |
| 02/09/1983 | EP0071464A1 Headphones |
| 02/09/1983 | EP0070872A1 Cordless telephone system |
| 02/08/1983 | US4373120 Line test termination device |
| 02/01/1983 | US4371751 Automatic telephonic user emergency message transmitting apparatus |
| 01/26/1983 | EP0070795A1 Telephone installation |
| 01/26/1983 | EP0070697A2 Telephone dialling system |
| 01/25/1983 | CA1140283A1 Test set |
| 01/18/1983 | US4369340 Wall telephone adapter assembly |
| 01/18/1983 | US4369338 Sub-miniature tone decoder |
| 01/18/1983 | US4369337 Central office interface circuit |
| 01/11/1983 | US4368432 Sine wave generator for different frequencies |
| 01/11/1983 | US4368363 Audible line test termination device |
| 01/11/1983 | US4368359 Wall telephone stand |
| 01/11/1983 | US4368358 Loop sharing in digital systems |
| 01/11/1983 | US4368357 Bypass apparatus for use in secure communication systems |
| 01/05/1983 | EP0068483A1 Electromechanical switch for telephone apparatuses |
| 01/04/1983 | US4367378 Telephone and holding band therefor |
| 01/04/1983 | US4367375 Push-button dial circuit |
| 01/04/1983 | US4366679 Evaporator plate for ice cube making apparatus |
| 12/23/1982 | WO1982004516A1 Hook flash signal actuated telephone control device |
| 12/22/1982 | EP0067776A1 Call progress tone detection circuit |
| 12/22/1982 | EP0067524A1 Fastener for assembling two hollow members |
| 12/22/1982 | EP0067268A2 Hook flash actuated telephone control device |
| 12/22/1982 | EP0067154A1 On-hook/off-hook detector circuit |
| 12/21/1982 | US4365118 Connection arrangement in a telephone instrument for connecting an additional speech device |
| 12/21/1982 | US4365116 Digital ringing-signal generator |
| 12/21/1982 | CA1138078A1 Printer control system |
| 12/14/1982 | US4363935 Mobile radio telephone system |
| 12/14/1982 | CA1137668A1 Telephone instrument apparatus for controlling related equipment and for enabling hands free usage |
| 12/07/1982 | CA1137241A1 Mechanical device for limiting duration of a telephone conversation |
| 12/01/1982 | EP0065635A1 Automatic telephone responder |
| 12/01/1982 | EP0065598A1 Improvements in telecommunication receivers |
| 11/30/1982 | CA1136787A1 Telephone set base, for both wall and desk mounting |
| 11/30/1982 | CA1136786A1 Base for telephone set, for alternative desk and wall mounting |
| 11/30/1982 | CA1136783A1 Telephone circuit |
| 11/25/1982 | WO1982004168A1 Circuit for generating analog signals |
| 11/24/1982 | EP0065335A1 Device for avoiding sustained disturbing oscillations in a closed-loop system and loud-speaking telephone apparatus utilising this device |
| 11/24/1982 | EP0065097A1 Electronic message generator connected to a telephone line |
| 11/23/1982 | US4360714 Telephone moveable cradle lock |
| 11/23/1982 | US4360710 Telephone circuit |
| 11/16/1982 | US4359607 Telephone answering apparatus with solid state and dynamic tape storage |
| 11/16/1982 | CA1135888A1 Pushbutton dial assembly |
| 11/16/1982 | CA1135887A1 Push-button dial assembly for telephones |
| 11/16/1982 | CA1135587A1 Register book holder |
| 11/11/1982 | WO1982003958A1 Telephone protective cover |
| 11/10/1982 | EP0064052A1 Fastening arrangement to keep together the parts of a telephone handset consisting of two case halves. |
| 11/09/1982 | US4358640 Telephone security device |