| Patents for H04M 1 - Substation equipment, e.g. for use by subscribers (168,223) |
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| 07/11/1989 | CA1257419A1 Network event identifiers |
| 07/06/1989 | EP0313562A4 Telephone on-hold device. |
| 07/06/1989 | EP0271535A4 Ergonomic telephone. |
| 07/06/1989 | DE3743838A1 Answering machine |
| 07/06/1989 | DE3742671A1 Method for a mobile electronic dialling aid on a telephone station |
| 07/05/1989 | EP0323059A2 Amplifier circuit |
| 07/04/1989 | US4845774 Apparatus for anchoring a telephone handset to a telephone housing |
| 07/04/1989 | US4845772 Portable radiotelephone with control switch disabling |
| 07/04/1989 | US4845760 Electro-acoustic transducer arranged within the handset of a telephone instrument |
| 07/04/1989 | US4845752 Multi-signal processor synchronized system |
| 07/04/1989 | US4845748 Method of assembling a telephone keypad |
| 07/04/1989 | US4845745 Display telephone with transducer |
| 07/04/1989 | US4845743 System for selectively receiving telephone calls |
| 07/04/1989 | US4845742 Dynamic microphone handset and amplifier unit |
| 07/04/1989 | US4845738 Hands-free type automobile telephone and general-purpose telephone |
| 07/04/1989 | US4844573 Electro-optical converter including ridgid support for optical fiber coupler, telephone set using the coupler and method of making same |
| 06/29/1989 | WO1989006077A1 Remotely commanded telephone switch enhancing system |
| 06/29/1989 | DE3742242A1 Telephone, particularly car telephone |
| 06/28/1989 | EP0321744A1 Circuit for electrical apparatuses |
| 06/27/1989 | US4843621 Speakerphone using digitally compressed audio to detect acoustic feedback |
| 06/27/1989 | US4843498 Dictating machine arranged like a telephone handset |
| 06/27/1989 | US4843385 Electronic lock system for a two-way radio |
| 06/27/1989 | CA1256617A1 Automatic telephone answering apparatus |
| 06/27/1989 | CA1256615A1 Personal computer - as an interface between a telephone station set and a business communication system |
| 06/27/1989 | CA1256613A1 Personal alarm system providing handsfree operation |
| 06/27/1989 | CA1256505A1 Fm-am communications system with portable unit |
| 06/22/1989 | DE3742359A1 Telephone station with pulse dialling and a DTMF signalling device |
| 06/22/1989 | DE3741788A1 Telephone set with a transmitting device |
| 06/21/1989 | EP0321244A2 Semi-conductor integrated circuit for a telephone |
| 06/21/1989 | EP0321222A2 Telephone |
| 06/21/1989 | EP0321103A2 A hook arrangement |
| 06/21/1989 | EP0321049A2 Telephone terminal with a signal processor |
| 06/21/1989 | EP0320934A2 An antibacterical protection device for telephone handsets |
| 06/21/1989 | EP0233892A4 A telephone line switch. |
| 06/21/1989 | CN1004603B Unmanned computerized communication system |
| 06/20/1989 | US4841568 Circuit arrangement for a telephone station with earth connection to the central supply device |
| 06/20/1989 | US4841567 Memory device |
| 06/20/1989 | US4841566 Hold and dial accessory for telephone instrument |
| 06/20/1989 | US4841559 Telephone network interface tester |
| 06/20/1989 | US4840582 Modular plug identification tag |
| 06/20/1989 | US4840258 Brief case with a portable wireless telephone |
| 06/20/1989 | CA1256225A1 Computer-controlled cordless telephone |
| 06/15/1989 | DE3741072A1 Circuit arrangement for detecting an incoming call in a telephone set |
| 06/14/1989 | EP0319721A2 Security handset |
| 06/14/1989 | EP0319672A1 Device for controlling electric appliances |
| 06/13/1989 | US4839921 Telephone station comprising an optical display device |
| 06/13/1989 | US4839919 Telephone and demodulator |
| 06/13/1989 | US4839918 Switching system between cordless telephone and ordinary telephone |
| 06/13/1989 | US4839749 Recorded voice warning system for providing safety alerts and personal messages |
| 06/07/1989 | EP0319211A2 Radio telephone apparatus |
| 06/07/1989 | EP0319210A2 Radio telephone apparatus |
| 06/07/1989 | EP0319138A1 Modular plug coupler |
| 06/07/1989 | EP0319108A2 Hand set, particularly for a radiotelephone |
| 06/07/1989 | EP0318974A2 Circuit arrangement for an electronic dial pulsing switch in a subscriber station |
| 06/07/1989 | EP0318661A2 Line connection switching apparatus for connecting communication line in accordance with matching result of speech pattern |
| 06/07/1989 | CN1004464B Transmitter assembly for a telephone handset |
| 06/06/1989 | US4837819 Security handset |
| 06/06/1989 | US4837815 Armored cord handset |
| 06/06/1989 | US4837814 Telephone set |
| 06/06/1989 | US4837809 Telephone answering device having immediate playback function |
| 06/06/1989 | US4837808 Circuit connecting a voice-controlled device to a telephone station and line |
| 06/06/1989 | US4837803 Telephone answering device having function of playback without rewinding tape |
| 06/06/1989 | US4837802 Radio communication method and system |
| 06/06/1989 | US4837801 Base station capable of monitoring occurrence of interference on every transmission |
| 06/06/1989 | US4837797 Electronic message unit and methods using same |
| 06/06/1989 | US4836107 Arrangement of modular subassemblies |
| 06/06/1989 | CA1255410A1 Subscriber line circuit having improved ac impedance matching |
| 06/06/1989 | CA1255407A1 Telephone line interface option module |
| 06/01/1989 | DE3838856A1 Hook switch of a telephone set |
| 06/01/1989 | DE3741278C1 Arrangement for uniform utilisation of several addressable memory positions of an EEPROM |
| 05/31/1989 | EP0318454A2 Mass-distributed, preprogrammed automatic dialing mechanism and related processes |
| 05/31/1989 | EP0317708A1 Radio transmission method for flexless telephones |
| 05/31/1989 | CN2038692U Automatic telephone recorder with digital ic |
| 05/30/1989 | US4835484 Gain control circuit for suppressing Larsen effect in a loudspeaker telephone |
| 05/30/1989 | US4834551 Call holding alert system |
| 05/30/1989 | CA1255025A1 Radio telephone system and method for controlling same |
| 05/24/1989 | EP0317496A1 Telephone apparatus provided with a subscriber directory |
| 05/24/1989 | EP0317167A1 Moisture barrier assembly |
| 05/24/1989 | EP0316883A2 Facsimile device |
| 05/24/1989 | EP0316721A2 Electronic earth key |
| 05/24/1989 | EP0235127B1 Hands-free control system for a radiotelephone |
| 05/24/1989 | DE3806550A1 Dialling device |
| 05/24/1989 | DE3738829A1 Private telephone branch exchange |
| 05/24/1989 | CN2038304U Transmitter-receiver with good tone quality connected externally to a radio telephone |
| 05/23/1989 | US4833707 Telephone lock unit |
| 05/23/1989 | US4833705 Data communication apparatus |
| 05/23/1989 | US4833704 Automatic telephone answering and recording device with automatic two-way conversation recording function controlled by off/on hook detector |
| 05/23/1989 | US4833703 On-hook control circuit for answering machine |
| 05/23/1989 | US4833700 Mobile phone interface |
| 05/23/1989 | CA1254639A1 Programmable telephone switcher |
| 05/18/1989 | DE3737647A1 Circuit arrangement for switching over connections in a communications device |
| 05/18/1989 | DE3737623A1 Mounting of electroacoustic transducers within a handset for telephone sets |
| 05/18/1989 | DE3737622A1 Arrangement for protection against voltage flashovers in handsets of telephone sets |
| 05/18/1989 | DE3737529A1 Transfer facility |
| 05/17/1989 | EP0315860A2 Caller identification for a telephonic device |
| 05/17/1989 | CN2037904U Pulse-button type telephone-number code-adding limiter |
| 05/16/1989 | US4831651 Intermediate amplifier for use in two-wire connections of a dial telephone network and method for the gain control of said amplifier |
| 05/16/1989 | US4831646 Automatic telephone answering device for automatically setting standby mode |
| 05/16/1989 | CA1254276A1 Indoor type telephone network interface device |
| 05/16/1989 | CA1254264A1 Battery fitting device usable for electronic appliance |