| Patents for H04M 1 - Substation equipment, e.g. for use by subscribers (168,223) |
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| 07/01/1987 | EP0227390A2 Rotary electrical connector apparatus |
| 07/01/1987 | EP0227327A2 Communication systems and terminals therefor |
| 07/01/1987 | EP0227185A2 Method and device for inaudible exchange of identification signals between radio-telephones |
| 07/01/1987 | EP0227148A1 A method of sharing duplex channels in an automatic channel selection system and an automatic channel selection system in which this method is applied |
| 07/01/1987 | EP0226708A2 Electrical device for blocking outgoing calls from a telephone apparatus |
| 07/01/1987 | EP0226610A1 Installation with portable, wireless telephone sets. |
| 06/30/1987 | US4677667 Subscriber line circuit having improved AC impedance matching |
| 06/30/1987 | US4677666 Adaptive line hybrids |
| 06/30/1987 | US4677663 Telephone answering and call forwarding improvement |
| 06/30/1987 | US4677662 Multiple line self-contained telephone |
| 06/30/1987 | US4677657 Voice recording card |
| 06/30/1987 | US4677655 Cordless telephone with automatic telephone answering/recording function |
| 06/30/1987 | US4677501 Method and apparatus for displaying indications of instructions in previously recorded messages |
| 06/30/1987 | CA1223656A1 Network interface device |
| 06/23/1987 | US4675903 Telephone handset assembly |
| 06/23/1987 | US4675902 High performance telephone instrument with combination pulse and tone dialing capacity |
| 06/23/1987 | US4675901 Automatic disconnect device with protected ringer |
| 06/23/1987 | US4675898 Single tone telephone receiver |
| 06/23/1987 | US4675897 Automatic telephone answering apparatus and method having voice monitoring function |
| 06/23/1987 | US4675863 Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels |
| 06/19/1987 | DE3617972C1 Dialling restriction for a telephone device |
| 06/19/1987 | DE3545150A1 Circuit arrangement for an operating element of a telephone terminal device, in particular a telephone set |
| 06/19/1987 | DE3544394A1 Circuit arrangement for polarity-independent dial pulse generation in a subscriber device |
| 06/18/1987 | WO1987003764A1 Telephone line interface option module |
| 06/17/1987 | CN85108858A Support for receivers of portable battery-operated telephones |
| 06/16/1987 | US4674120 Hook switch actuator assembly |
| 06/16/1987 | US4674118 Telephone line hold and hold release apparatus |
| 06/16/1987 | US4674115 Programmable telephone switcher |
| 06/16/1987 | US4674111 Method and apparatus for automatic dialing in mobile radio telephone systems |
| 06/16/1987 | US4673916 Method and system for decoding a digital signal using a variable frequency low-pass filter |
| 06/16/1987 | US4673861 Battery charger/remote control for portable radio devices |
| 06/16/1987 | US4673228 Rotary electrical connector apparatus |
| 06/16/1987 | EP0225538A1 Speech recognition system with an accurate recognition function |
| 06/16/1987 | CA1223097A1 Plate |
| 06/16/1987 | CA1223081A1 Circuit board with contact positions, as used for telecommunications terminals and other apparatus |
| 06/10/1987 | EP0224626A1 Multi-signal processor synchronized system |
| 06/09/1987 | US4672666 Telephone handset for a telephone set |
| 06/09/1987 | US4672664 Telephone line monitor amplifier |
| 06/09/1987 | US4672663 Telephone handset detector |
| 06/09/1987 | US4672660 Method and system for identifying telephone callers |
| 06/09/1987 | US4672659 Single tape automatic telephone answering machine |
| 06/09/1987 | US4671140 Control for steplessly variable transmission |
| 06/04/1987 | DE3542490A1 Telephone handset |
| 06/04/1987 | DE3542424A1 Holding device |
| 06/04/1987 | DE3542325A1 Securing element |
| 06/04/1987 | DE3542299A1 Holding device for a telephone microphone |
| 06/04/1987 | DE3541898A1 Automatic answering machine operated on a telephone device with a selective call indicator |
| 06/02/1987 | US4670903 Echo canceller for attenuating acoustic echo signals on a frequency divisional manner |
| 06/02/1987 | US4670747 Alphanumeric entry system having an electronic lock feature |
| 06/02/1987 | US4670628 Reprogrammable call forwarding device |
| 06/02/1987 | CA1222586A1 Personal-servicing communication system |
| 05/27/1987 | EP0223337A2 Cordless telephone |
| 05/27/1987 | EP0223065A2 Method for a multifunctional telecommunication apparatus |
| 05/27/1987 | DE3541546A1 Arrangement for the implementation of an earth key function |
| 05/27/1987 | DE3541383A1 Telephone set with ancillary speech equipment |
| 05/27/1987 | DE3541115A1 Arrangement for reducing memory errors of a byte-organised solid-state memory |
| 05/27/1987 | DE3541114A1 Arrangement for reducing memory errors of a solid-state memory, in particular an EEPROM |
| 05/26/1987 | US4669110 Call progress tone system |
| 05/26/1987 | US4669109 Telephone apparatus with a fixed telephone station coupled to a mobile and detachable handset |
| 05/26/1987 | US4669100 Charge-coupled device having a buffer electrode |
| 05/26/1987 | CA1222335A1 Speech synthesized telephone answering circuit |
| 05/26/1987 | CA1222293A1 Automatic linear compression circuit |
| 05/21/1987 | DE3540301A1 Automatic telephone number transmitter for telephone devices |
| 05/20/1987 | EP0222083A1 Method and apparatus for voice detection having adaptive sensitivity |
| 05/19/1987 | US4667065 Apparatus and methods for electrical signal discrimination |
| 05/13/1987 | EP0221835A2 Telephone apparatus with an interface for connection to a processing stage |
| 05/13/1987 | EP0221589A1 Device for establishing a connection between a telecommunication network and a controllable system, such as a computer system, provided with an access control unit controllable via a separate network terminal |
| 05/13/1987 | EP0221090A1 Single line telephone communication system |
| 05/07/1987 | WO1987002848A1 Portable radio battery pack with on-off switch |
| 05/07/1987 | DE3538486A1 Method and circuit for calling the other telephone set in a telephone system |
| 05/06/1987 | CN86102938A Expanding apparatus for telephone subscriber's loop |
| 05/05/1987 | US4663675 Apparatus and method for digital speech filing and retrieval |
| 05/05/1987 | CA1221482A1 Telephone instruments |
| 05/05/1987 | CA1221481A1 Hookswitch bounce resistant telephone hold-mute circuit |
| 04/29/1987 | CN85204628U Calling signal generator with squelch circuit for button type telephone |
| 04/28/1987 | US4661977 Telephone |
| 04/28/1987 | US4661976 Automatic telephone dialer utilizing an electronic telephone book |
| 04/28/1987 | US4661970 Cordless telephone system |
| 04/28/1987 | US4661659 Wireless phone system communicatively combined with a computer |
| 04/22/1987 | EP0218888A2 Telephone circuits |
| 04/21/1987 | US4660218 Apparatus for switching telephone line a response device, a data terminal or a telephone |
| 04/21/1987 | US4659876 Audiographics communication system |
| 04/15/1987 | EP0218482A2 Radio telephone system |
| 04/15/1987 | EP0218450A2 Control system of a radio telephone apparatus |
| 04/15/1987 | EP0218296A2 Sub-assembly for electrical apparatus and electrical apparatus including such a sub-assembly |
| 04/15/1987 | EP0218295A2 Telephone instrument |
| 04/15/1987 | EP0218294A2 Telephone instrument |
| 04/14/1987 | US4658421 Telephone set stand |
| 04/14/1987 | US4658417 Information transmission/reception system using pushphone and information reception apparatus |
| 04/08/1987 | EP0217330A2 Line switching circuit for cordless telephone |
| 04/08/1987 | EP0216806A1 Circuit Device used as an Interface between a Computer and an Accessory Device. |
| 04/08/1987 | CN86203102U Rotating table for telephones |
| 04/07/1987 | US4656660 Office line holding circuit with an automatic release function for direct connection telephone system |
| 04/07/1987 | US4656657 Telephone monitoring device |
| 04/07/1987 | US4656653 Cordless telephone apparatus having means for synchronizing channel scanning of fixed and portable units |
| 04/07/1987 | US4656318 Modem with power-off ring detection |
| 04/07/1987 | US4655521 Multicomponent telephone block access system |
| 04/07/1987 | CA1220265A1 Method and apparatus for providing call tracing service |
| 04/07/1987 | CA1220119A1 Method for producing in wood a case for a telephone apparatus, a hand microtelephone or some other casing used within the telecommunications industry |
| 04/01/1987 | EP0216528A2 Automatic telephone answering apparatus |