| Patents for H04M 1 - Substation equipment, e.g. for use by subscribers (168,223) |
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| 05/24/1988 | US4747125 Programmed conversation recording system with variable patience interval |
| 05/24/1988 | US4747123 MF signal transmitting control apparatus/method for use in cordless telephone system |
| 05/24/1988 | US4747120 Automatic personnel monitoring system |
| 05/24/1988 | CA1237211A1 Telephone set structure having a member capable of being inserted in invertible position |
| 05/24/1988 | CA1237210A1 Multiple line self-contained telephone |
| 05/24/1988 | CA1237209A1 Call signal detecting device |
| 05/19/1988 | WO1988003653A1 Wire tester |
| 05/18/1988 | EP0267220A1 Telephone instruments |
| 05/18/1988 | CN86107477A Non-relay circuit for the carrier's audiofrequency terminal panel |
| 05/17/1988 | CA1236942A1 Variable colour display telephone |
| 05/11/1988 | EP0266678A2 Radio telephone apparatus |
| 05/11/1988 | EP0137382B1 Handset, especially for a car telephone |
| 05/11/1988 | DE3723261A1 Fernsprecheinrichtung mit ohrmikrofon Telephone device with ear microphone |
| 05/10/1988 | US4744101 Cordless telephone system |
| 05/10/1988 | CA1236607A1 Microphone arrangement |
| 05/10/1988 | CA1236606A1 Cordless telephone system |
| 05/10/1988 | CA1236605A1 Method of establishing a mutual matching code for a base unit and a mobile unit, more specifically a telephone, and an arrangement for putting the method into effect |
| 05/10/1988 | CA1236604A1 Automatic telephone dialing method and apparatus |
| 05/05/1988 | WO1988003344A1 Telephone structure |
| 05/05/1988 | DE3637407A1 Sound pick-up for telephone sets |
| 05/04/1988 | EP0266044A2 Telecommunication security system and key memory module therefor |
| 05/04/1988 | EP0265944A2 Cordless telephone system |
| 05/04/1988 | EP0265943A2 Radio telephone system |
| 05/03/1988 | US4742542 Telephone switch-hook actuator apparatus |
| 05/03/1988 | US4742540 Circuit for switching between balanced networks |
| 05/03/1988 | US4742539 Telephone loop current modulator |
| 05/03/1988 | US4742538 Current source and off-hook detector |
| 05/03/1988 | US4742537 Telephone line monitoring system |
| 05/03/1988 | US4742351 IC card system |
| 05/03/1988 | CA1236231A1 Telephone handset detector |
| 04/28/1988 | DE3636692A1 Method for coupling a multifunctional ancillary signal generator |
| 04/27/1988 | EP0265064A2 Multi-alert radio paging receiver |
| 04/27/1988 | EP0264644A2 Circuit arrangement for simulating the NSI contact by means of the hold circuit in a two-way telephone set |
| 04/27/1988 | CN87102534A Glow word board and finger plate of telephone |
| 04/26/1988 | US4741049 Automatic channel selecting system using shared duplex channels |
| 04/26/1988 | US4741034 Receptacle for telephone handset |
| 04/26/1988 | US4741033 Telephone serving as both table mounted type and wall hung type |
| 04/26/1988 | US4741031 For use in a hazardous environment |
| 04/26/1988 | US4741030 Communications headset |
| 04/26/1988 | US4741029 Automatic telephone dialing method and apparatus |
| 04/26/1988 | US4741019 Cordless telephone |
| 04/26/1988 | CA1235765A1 Modular plug connector |
| 04/26/1988 | CA1235753A1 Signal transmission apparatus for a multiple channel system and method for using the same |
| 04/21/1988 | WO1988002964A1 Telephone system |
| 04/21/1988 | DE3630471A1 Circuit arrangement for indicating the call number of a calling subscriber at the telephone set of the called subscriber |
| 04/20/1988 | EP0264092A2 Telephone system |
| 04/20/1988 | EP0264018A1 Method for the control of the amplification in telephone apparatuses with an electronic speech circuit, and device for carrying out this method |
| 04/20/1988 | EP0150181B1 Method and apparatus for displaying at a selected station special service information during a silent interval between ringing |
| 04/19/1988 | US4739451 Modularly expandable desktop keyboard |
| 04/14/1988 | DE3634658A1 Arrangement for protection against voltage flash-over in telephony handsets |
| 04/14/1988 | DE3634620A1 Arrangement for protecting against voltage flash-over in telephony handsets |
| 04/14/1988 | DE3634619A1 Arrangement for protecting against voltage flash-over in telephony handsets |
| 04/13/1988 | EP0263666A2 Cordless telephone apparatus |
| 04/13/1988 | EP0263416A1 Electronic speech circuit |
| 04/12/1988 | US4737987 Circuit for evaluating call signals in a telecommunication system |
| 04/12/1988 | US4737986 Subscriber's line closing circuit |
| 04/12/1988 | US4737984 Dial tone detector |
| 04/12/1988 | US4737982 Reprogrammable call forwarding device |
| 04/12/1988 | US4737981 Telephone control device |
| 04/12/1988 | US4737979 Automatic telephone answering device with paging function |
| 04/12/1988 | US4737976 Hands-free control system for a radiotelephone |
| 04/12/1988 | US4737883 Keyboard for electrical devices |
| 04/12/1988 | CA1235242A1 Static discharge snubber circuit for silicon controlled rectifier (scr) type telephone devices |
| 04/12/1988 | CA1235239A1 Circuit for detecting keypad conditions in a microprocessor controlled telephone instrument |
| 04/06/1988 | EP0262991A2 Integrated multi-display overlay-controlled communicating workstation |
| 04/06/1988 | EP0262978A2 Automatic telephone answering apparatus |
| 04/06/1988 | EP0262957A2 Dial impulse generating circuit in a radio telephone |
| 04/06/1988 | EP0262915A2 A combination telephone handset and headset device |
| 04/06/1988 | EP0262839A2 Switching system between cordless telephone and ordinary telephone |
| 04/06/1988 | EP0262803A2 Howler indicator in cordless telephone system |
| 04/05/1988 | US4736461 Method of transmitting terminating call signals within a restricted duration and a base station and a portable unit for use in the same |
| 04/05/1988 | US4736418 Soft cover for telephone |
| 04/05/1988 | US4736417 Adjustable telephone handset support |
| 04/05/1988 | US4736416 Telephone sterilizer having an ozone gas producing unit |
| 04/05/1988 | US4736411 Telephone instrument |
| 04/05/1988 | US4736410 Telephone equipment for reduced key operations |
| 04/05/1988 | US4736405 Communication system with operation-procedure guiding function by speech |
| 04/05/1988 | US4736404 Security arrangement for cordless telephone system |
| 04/05/1988 | US4736403 Telephone line tester |
| 04/05/1988 | US4736266 Printed circuit board and a circuit assembly for a radio apparatus |
| 04/05/1988 | CA1234875A1 Radio communication system comprising a portable unit carrying out a battery saving operation related to a scanning operation of a fixed unit |
| 03/31/1988 | DE3633276A1 Telephone number directory and connection thereof to a subscriber station with number memory |
| 03/31/1988 | DE3632478A1 Telephone station with electronic answering machine |
| 03/30/1988 | EP0262065A1 Communication device for lobbies of buildings |
| 03/30/1988 | EP0261992A2 Cordless telephone apparatus |
| 03/30/1988 | EP0261807A2 Telephone cradle mount |
| 03/30/1988 | EP0261495A2 Electronic reminder |
| 03/30/1988 | EP0109431B1 Combined handset and headset arrangement |
| 03/30/1988 | CN87208358U Amplifier of telephone without edditional power source |
| 03/29/1988 | US4734931 In a business communication system |
| 03/29/1988 | US4734930 Voice recording apparatus |
| 03/29/1988 | US4734929 Telephone answering machines for collect call |
| 03/29/1988 | US4734679 Pushbutton keyboard assembly |
| 03/24/1988 | WO1988002206A1 Communication interface |
| 03/24/1988 | DE3631068A1 Cordless telephone system |
| 03/23/1988 | EP0260991A2 Radio communication system and method |
| 03/23/1988 | EP0260523A1 Holder for a circuit board in a housing consisting of two parts |
| 03/23/1988 | EP0260352A1 Mobile telephone answering and recording apparatus |
| 03/23/1988 | CN86106026A System for interfacing a standard telephone set with a radio transceiver |
| 03/22/1988 | CA1234437A1 Office line interface circuits |