| Patents for H04M 1 - Substation equipment, e.g. for use by subscribers (168,223) |
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| 02/27/1991 | EP0413963A2 Radio communication apparatus for rapidly knowing whether the apparatus is within or out of a service area |
| 02/27/1991 | CN2072302U Suction cup type telephone recording wireless microphone |
| 02/27/1991 | CN1049587A Subscriber circuit capable of suppressing in-phase induced noise |
| 02/27/1991 | CN1049581A Subscriber unit for wireless digital subscriber communication system |
| 02/26/1991 | US4996710 Side-tone adjusting system and method for key telephone system establishing a plurel kinds of speaking paths |
| 02/26/1991 | US4996709 Intercom telephone |
| 02/26/1991 | US4996708 Key telephone system adapted to respond to information stored in a portable outpulser |
| 02/26/1991 | US4996697 Deglitching means for digital communication systems |
| 02/26/1991 | CA1280795C Vandal resistant telephone keypad switch |
| 02/26/1991 | CA1280723C Corrosion protection apparatus |
| 02/24/1991 | CA2023444A1 Telephone systems |
| 02/21/1991 | WO1991002422A1 Electronic apparatus for ''hands off'' control of a voice mail system |
| 02/20/1991 | EP0413364A2 Dial number generator |
| 02/20/1991 | CN2071853U Telephone with photoelectric high-voltage protection device |
| 02/19/1991 | US4995110 Method and apparatus for keyboard adaptation to a low power controller in a coin operated telephone |
| 02/19/1991 | US4995083 Method of establishing a radio link in one of a plurality of channels between two radio units |
| 02/19/1991 | US4995077 Card-like device having a microprocessor and speaker for communicating with a telephone line |
| 02/19/1991 | US4995076 Call progress capability for a switched channel data service unit |
| 02/19/1991 | US4995072 Self-powered base and remote telephone communication set |
| 02/19/1991 | US4995070 Electronic key telephone set with function operation test function and method of controlling the same |
| 02/19/1991 | US4994802 Subscriber unit for wireless digital telephone system |
| 02/19/1991 | US4994759 Current equalizing circuit |
| 02/19/1991 | US4993962 Closed type connecting block |
| 02/19/1991 | US4993244 Locking apparatus for a cellular phone |
| 02/19/1991 | CA1280525C Telephone having receive call indicating function and mute/light key |
| 02/13/1991 | EP0412769A2 Mobile telephone system having message recording mode of operation during failures |
| 02/13/1991 | EP0412560A2 Hybrid circuit |
| 02/12/1991 | US4993065 Accessory communication device for telephone sets |
| 02/12/1991 | US4993062 Telephone control system including stored blocked and allowed telephone numbers |
| 02/12/1991 | US4993061 Portable miniature high fidelity stereo tape player and cordless radio telephone system |
| 02/12/1991 | US4993060 Portable device for use by a news reporter |
| 02/12/1991 | US4993022 System for and method of multiplexing speech signals utilizing priority signals for individual transmission channels |
| 02/12/1991 | US4992909 Telecommunications installation box |
| 02/12/1991 | CA1280229C Infrared hookswitch for a telephone |
| 02/12/1991 | CA1280202C Telephone handset for use in noisy locations |
| 02/12/1991 | CA1280171C Portable wireless communication apparatus |
| 02/07/1991 | DE4019530A1 Communications head set e.g. for conference - includes earpiece and microphone with adjustable ear and chin supports |
| 02/07/1991 | DE3919061A1 Telephone register and amplified speech combination device - has drawer number register and speech-microphone electronics in housing |
| 02/07/1991 | CA2016011A1 Radio transceiver with optional dsplay |
| 02/07/1991 | CA2016010A1 Interchangeable control panels and keypads for radio transceivers and related process |
| 02/07/1991 | CA2016009A1 Method and apparatus for externally defining the operational mode of a digital radio transceiver |
| 02/06/1991 | EP0410978A1 Animated data display interleaving. |
| 02/05/1991 | US4991202 Coin call telephone apparatus |
| 02/05/1991 | US4991199 Computer and telephone apparatus with user friendly computer interface and enhanced integrity features |
| 02/05/1991 | US4991198 Interconnection control method in cordless telephone system |
| 02/05/1991 | US4991197 Method and apparatus for controlling transmission of voice and data signals |
| 02/05/1991 | US4989805 Retractable reel assembly for telephone extension cord |
| 01/30/1991 | EP0410698A2 Hands-free telephone |
| 01/30/1991 | EP0410344A2 Apparatus and method for control of storing information into dial memories in a telephone set |
| 01/29/1991 | US4989242 Control device for a hand-free alternate operating telephone set |
| 01/29/1991 | US4989241 Memory dial telephone finder |
| 01/29/1991 | US4989240 Telephone |
| 01/29/1991 | US4989239 Method and apparatus for preventing pay telephone fraud and reducing handset vandalism |
| 01/29/1991 | US4989237 Image data transmission apparatus |
| 01/29/1991 | US4989232 Device for processing digital signal in audio-frequency bandwidth |
| 01/29/1991 | US4989231 Mobile communication system and its control method |
| 01/29/1991 | US4989230 Cellular cordless telephone |
| 01/29/1991 | CA1279736C Terminal switching control apparatus |
| 01/29/1991 | CA1279722C Telephone handset construction |
| 01/29/1991 | CA1279708C Modular telephone jack outlet |
| 01/24/1991 | WO1991001069A1 Speaker drive arrangement for loudspeaker telephone |
| 01/24/1991 | WO1991001068A1 Method and apparatus for recording telephone messages |
| 01/24/1991 | DE4015091A1 Mobile radio telephone for vehicle - has holder at front and rear of handset, with dial buttons accessible when set down |
| 01/24/1991 | DE3923873A1 Loudspeaking telephone appts. with speaker in base - has microphone in handset, with sound inlet aperture pointing outwards with handset put down and lifted |
| 01/23/1991 | EP0409819A2 Mobile telecommunication terminal |
| 01/23/1991 | EP0409640A2 Connector assembly for electronic devices |
| 01/23/1991 | EP0409417A1 A pay telephone system |
| 01/23/1991 | EP0409346A1 Wall telephone unit |
| 01/23/1991 | EP0409129A1 Telephone set with engaging of the line without lifting the hook |
| 01/23/1991 | EP0409096A2 A vandal-proof handset for a pay telephone |
| 01/23/1991 | EP0408582A1 Telephone junction box and switch therefor. |
| 01/23/1991 | EP0144344B1 Ringing signal generator |
| 01/22/1991 | US4987592 Microphone boom assembly for communication headset |
| 01/22/1991 | US4987590 Multiple party telephone control system |
| 01/17/1991 | DE4019529A1 Headset outfit microphone mount and 2 earphones - has hoop shaped to fit over helmet with transducers held clear of outermost plane of ear |
| 01/17/1991 | DE3930278C1 Establishing stereo telephone connection - using integrated digital communication system for coualing two useful data channels and signalling channel |
| 01/17/1991 | DE3921940A1 Switching circuitry for telephone subscriber party line - has current supply circuit using exchange battery and call current recognition circuit |
| 01/16/1991 | EP0408041A2 A communication unit comprising caller identification function and caller identifying method in a digital communication network |
| 01/16/1991 | EP0408026A2 Mobile communications system insensitive to false frame sync |
| 01/16/1991 | EP0408024A2 Universal ISDN subscriber line connection group |
| 01/16/1991 | EP0407427A1 Improvements relating to telephone handsets |
| 01/15/1991 | US4985918 Automatic dialing apparatus and method of automatic dialing |
| 01/15/1991 | US4985916 Party line converter |
| 01/15/1991 | US4985913 Multiple message answering machine keyed to the incoming phone number |
| 01/15/1991 | US4985912 Radio telephone device |
| 01/15/1991 | US4985910 Method and apparatus for retrofitting a standard coin operated telephone employing a carbon microphone with a line powered electronic controller |
| 01/13/1991 | WO1991001067A2 Method for authentication and protection of subscribers in telecommunication systems |
| 01/10/1991 | WO1991000663A1 Acoustic coupling device for telephonometric measurements and/or controls in telephone handsets |
| 01/10/1991 | DE3922292C1 Dial lock for telephone subscriber's appts. - has call identifying circuit preventing dial tone detecting circuit operating exchange line connection switch |
| 01/10/1991 | DE3922010A1 Telephone party line circuit - with switch allowing each other subscriber to be disconnected from telephone line |
| 01/09/1991 | EP0406780A2 Office communication system for transmitting data and/or image information via a switched network |
| 01/09/1991 | CN2069188U Telephone automatic recording device |
| 01/09/1991 | CN2069187U Telephone automatic answer and recording device |
| 01/09/1991 | CN2069186U Digital selective telephone calling extension device |
| 01/09/1991 | CN1011180B Circuit of unmanned automatic and recordable telephone |
| 01/08/1991 | US4984295 Programmable electronic device |
| 01/08/1991 | US4984269 Telephone bracket, in particular for vehicles |
| 01/08/1991 | US4984268 Telephone handset construction |
| 01/08/1991 | US4984265 Device for forming the hands-free function in a telephone set, associating the gain switching and echo suppression functions |
| 01/08/1991 | CA1278829C Rapid processing of immediately successive arrival signals in a base station of a radio communication network |