Patents
Sitemap › H04 - Electric communication technique › H04M - Telephonic communication › H04M 1 - Substation equipment, e.g. for use by subscribers
Patents for H04M 1 - Substation equipment, e.g. for use by subscribers (168,223)
01/1985
01/22/1985US4495382 Telephone regulator circuitry
01/22/1985CA1181541A1 Loudspeaking telephone
01/15/1985US4493950 Loudspeaker telephone
01/15/1985CA1181187A1 Anti-larsen-effect arrangement in a telephone station equipped with a loudspeaker
01/15/1985CA1181160A1 Post-auricle contoured headset for two-way voice communication
01/09/1985EP0130553A2 Improvements in telephone instruments
01/08/1985US4493101 Anti-howl back device
01/08/1985US4492927 Offset voltage compensation circuit
01/08/1985US4492824 Speakerphone linear comparator
01/08/1985US4492823 Dual timing circuit for telephone subscriber's instrument
01/08/1985US4492820 Telephone alarm system
01/08/1985CA1180815A1 Digital tone generator
01/08/1985CA1180741A1 Pushbutton switch and integral lamp for telephone dials
01/02/1985EP0129843A2 Multiparty line adaptor with privacy feature
01/02/1985EP0129547A1 Automatic selection apparatus for telephone
01/01/1985USRE31789 Telephone information displaying device
01/01/1985US4491907 Plurality of processors sharing the memory, the arithmetic logic unit and control circuitry all on a single semiconductor chip
01/01/1985US4491889 Cassette tape player
01/01/1985US4491699 Communication apparatus for hostile environments
01/01/1985US4491696 Telephone set base
01/01/1985US4491695 Mounting for a dial in a telephone set base
01/01/1985US4491694 Telephone to stereo amplifier interface coupling
01/01/1985US4491692 Light-emitting device mounted under keybuttons of a keyboard
01/01/1985US4491691 Electronic tone ringer
01/01/1985US4491689 Amplifier for use with telephone transmitter mounted in hand held telephone unit
12/1984
12/27/1984EP0129208A2 Handsfree circuit for telephone instrument
12/27/1984CA1180141A Echo canceller system
12/25/1984US4490820 Reception system for key telephone system
12/25/1984US4490586 Telephone ear piece lock
12/25/1984US4490584 Infrared remote telephone system level control
12/25/1984US4490582 Speakerphone control circuit
12/25/1984US4490579 Auto-dialing pager receiver
12/19/1984EP0128500A2 Telephone with cradle having no moving parts
12/18/1984US4489310 Time slot-controlling circuit for keyboard switch module, and apparatus incorporating same
12/18/1984CA1179798A1 Telephone handset amplifier circuit
12/12/1984EP0072813B1 Hook switch for a telephone instrument of single body type
12/11/1984US4488011 On-premise telephone test jack
12/11/1984US4488009 Compact telephone unit with a plug-in module
12/11/1984US4488005 Telephone answering apparatus with call-screening capabilities
12/06/1984WO1984004857A1 Ringing signal generator
12/05/1984EP0127517A1 Junction circuit for an exchange trunk
12/05/1984EP0127349A2 Network interface device
12/04/1984CA1179081A1 Telephone construction
12/04/1984CA1179041A1 Dialing system for teleprinters
11/1984
11/28/1984EP0126496A2 Electronic padlock for a subscriber telephone line
11/27/1984US4485273 Intercom adapter for telephones
11/27/1984CA1178730A1 Telephone call progress tone and answer identification circuit
11/21/1984EP0125842A2 Data stored display device, e.g. a wrist watch
11/20/1984US4484036 Telephone ring detector system
11/20/1984US4484034 Anti-larsen-effect arrangement in a telephone station equipped with a loudspeaker
11/20/1984US4484033 Rack for a wall-mounted telephone
11/20/1984US4484029 Cordless telephone switch and line selector
11/20/1984US4484027 Security system for SSTV encryption
11/20/1984US4483414 Sound dampening device for telephones
11/20/1984CA1178387A1 Compatible receive amplifier for telephone handsets having electronic and electro-mechanical transmitters
11/20/1984CA1178385A1 Adaptive echo cancelling circuit for use in a long- distance telephone network
11/14/1984EP0124526A1 Telephone system with computer generated dial pad and automatic dialling
11/13/1984US4482787 Telephone-call prohibit circuit
11/13/1984CA1177978A1 Call progress signal monitor and method for telephone systems
11/06/1984USRE31728 Test set
11/06/1984US4481384 Voice recognizing telephone call denial system
11/06/1984US4481382 For use in placing and receiving telephone calls
11/06/1984CA1177566A1 Digital communications terminal as a subscriber and/or exchange station in a digital communications installation, more particularly as a terminal for a telephone installation or telephone private branch exchange
10/1984
10/31/1984EP0123430A1 Control system for apparatuses in the environment of a disabled person
10/31/1984EP0123330A2 Circuital arrangement for counting and dividing the taxation impulses pertaining to a generical telephone line
10/31/1984EP0123206A2 Telephone set with a call number memory
10/30/1984US4480154 Automatic telephone silencer
10/30/1984CA1177152A1 Television remote control system for selectively controlling a plurality of external apparatus
10/25/1984WO1984004219A1 Telephone autodiallers
10/24/1984EP0122680A1 Transmission circuit for a DTMF telephone set
10/24/1984EP0122354A2 Telephone exchange
10/24/1984EP0122331A2 Automatic call answering device
10/23/1984US4479066 AC/DC Current divider circuit
10/23/1984US4479033 Telephone extension system utilizing power line carrier signals
10/17/1984EP0121927A2 Control equipment for a car telephone
10/16/1984US4477698 Apparatus for detecting pick-up at a remote telephone set
10/16/1984US4477141 Tricoupler for modular wiring systems
10/10/1984EP0121508A2 A method to influence an audio source during telephone operation, and a device for utilization of the method
10/10/1984EP0121220A2 Fixation of a chassis in the housing of a telephone station
10/10/1984EP0120959A1 Telephone extension system
10/10/1984EP0028229B1 A balanced amplifier output stage
10/09/1984US4476354 Telephone device
10/09/1984CA1175933A1 Subscriber telephone station
10/03/1984EP0120477A2 Arrangement for the automatic dialing of abbreviated numbers
10/03/1984EP0120476A2 Arrangement for the automatic dialing of abbreviated numbers
10/03/1984EP0120418A1 Wireless telephone
10/03/1984EP0120325A1 Circuit arrangement for a hands free telephone
10/03/1984EP0064052B1 Fastening arrangement to keep together the parts of a telephone handset consisting of two case halves
10/02/1984US4475193 Power line carrier multi telephone extension system for full duplex conferencing between telephones
10/02/1984US4475013 Repertory automatic telephone dialing apparatus wherein a name and telephone number are searched by depressing one or more letter code keys
10/02/1984US4475012 Subscriber telephone set incorporating overvoltage protection
09/1984
09/26/1984EP0119889A1 Dynamic coding method and device for the identification of remote transmission apparatuses
09/26/1984EP0119602A1 Holder for a wireless telephone
09/26/1984EP0119601A1 Anti side tone circuit for a centrally fed telephone exchange
09/25/1984US4473720 Automatic dialer for telephone numbers with portable module
09/25/1984US4473265 Surface mounted shielded telephone jack
09/25/1984CA1175174A1 Automatic telephone answering and message recording device
09/25/1984CA1175172A1 Key telephone area voice paging circuit and method
09/19/1984EP0118920A2 Automatic telephone exchange with hands free operation
09/19/1984EP0118594A1 Method of transmitting a coded message
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