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)
11/1990
11/21/1990CN1047182A Dialing features for cellular telephone with standard telephone set
11/21/1990CN1047181A Cellular telephone with standard telephone set
11/20/1990US4972491 Ear-mic headset/eardefender
11/20/1990US4972457 Portable hybrid communication system and methods
11/20/1990US4972454 Radio telephone apparatus and a method of controlling same
11/20/1990US4971581 Connector guard for a telephone line overvoltage protection device
11/20/1990US4971567 Modular jack
11/20/1990CA1276714C Time stamp and packet virtual sequence numbering for reconstructing information signals from packets
11/15/1990WO1990013961A1 Voice messaging for pay phone telephone systems
11/15/1990WO1990013959A1 Interlock circuit for preventing corruption of telephone line signals
11/14/1990EP0396947A2 Method for simplifying the use of complex systems, particularly of communication transmitters
11/14/1990EP0396886A2 Current switch for use in telephony systems or the like
11/14/1990EP0396727A1 Telephone circuits
11/14/1990CN1047004A Telephone support device
11/13/1990CA1276286C Telephone handset having housings assembled without mechanical fasteners
11/11/1990WO1990014729A1 Cellular telephone with standard telephone set
11/11/1990WO1990013962A1 Dialing features for cellular telephone with standard telephone set
11/07/1990EP0396300A2 Communications headset
11/07/1990EP0396253A1 Data transmission system for reading and converting bar coded information into standard telephone signals
11/07/1990EP0396190A2 Telephone set with a detachable operation section
11/07/1990EP0396105A2 Data communication terminal system capable of switching between telephone receiver and data terminal unit
11/07/1990EP0395755A1 Radio telephone system with base unit and mobile unit, and associated method of registering an identification code
11/06/1990US4969205 Radio communication system
11/06/1990US4969187 Telephone set
11/06/1990US4969181 Loudspeaker apparatus and method for a radio telephone apparatus
11/06/1990US4969180 Cordless pen telephone handset
11/06/1990US4969179 Telephone line monitoring circuit for providing a visual and auditory signal if the telephone line becomes inoperative
11/06/1990US4969178 Multipurpose subscriber local line monitoring device
11/06/1990CA1276045C Radio communication method and system
11/06/1990CA1276040C Modularly expandable desktop keyboard
11/01/1990WO1990013198A2 Device for transmitting information
11/01/1990WO1990013196A1 Device for telecommunication systems
10/1990
10/31/1990EP0395141A1 Electronic telephone set
10/31/1990EP0395092A2 Mobile telephone system
10/31/1990EP0394811A2 Method for the realisation of a communication connector assisted by an EDP device
10/31/1990EP0394747A2 Holding device for radiotelephone
10/31/1990EP0394744A2 Radiotelephone e.g. for motorcars
10/31/1990DE4013420A1 Netzsteuereinrichtung Network controller
10/30/1990US4966827 Polymer printing
10/30/1990CA1275749C Telephone cradle mount
10/30/1990CA1275726C Electroacoustic calling device
10/25/1990DE3913754A1 Steuereinrichtung Controller
10/25/1990DE3913273A1 Portable radio telephone handset carrier - has belt threaded through openings at each end of elongate holder
10/25/1990DE3912168A1 Plug and socket connector for telecommunications applications - has spring contact pairs that are separated by action of inserting plug
10/25/1990CA2008035A1 Apparatus for telecommunication
10/24/1990EP0394012A1 Termination circuit for a two-wire transmission line
10/24/1990EP0393913A1 Digital telephone system
10/24/1990EP0393059A1 Method for terminating a telephone call by voice command.
10/23/1990US4965849 Cordless telephone
10/23/1990US4965833 Voice enhancer system
10/23/1990US4965824 Pay station telephone and dispenser for a commercial conveyance
10/23/1990US4965459 Telephone line security system
10/23/1990US4964284 For preventing plug of a telephone from being inserted into a line jack
10/18/1990WO1990012468A1 Telephone
10/18/1990DE3911915A1 Microprocessor-controlled telephone call redirection device - uses selection information held in memory to re-direct call from incoming line to outgoing line
10/17/1990EP0392446A2 Communication terminal unit having an automatic answering function
10/17/1990EP0392166A2 Device for testing the electro-acoustic transmission properties of telephone apparatus
10/17/1990CN2064139U Terminal box with long distance directly dialing limiter
10/17/1990CN2064138U Phone calling device
10/16/1990US4964161 Cover for a telephone handset
10/16/1990US4964159 Communication system having an automatic dialer
10/16/1990US4964121 Battery saver for a TDM system
10/16/1990CA1275323C Telephone handset with static discharge prevention
10/16/1990CA1275305C Power source control device in car telephone mobile station system
10/15/1990WO1990013195A1 Analog/digital voice storage cellular telephone
10/10/1990EP0391543A2 Microprocessor clock
10/10/1990EP0391524A2 Phase accumulation dual tone multiple frequency generator
10/10/1990EP0391469A1 Control circuit for amplified listening
10/10/1990EP0391020A1 Housing for a portable radio telephone device
10/10/1990CN1046078A Communications systems
10/09/1990US4962543 Battery rundown protection system for an automobile having a radio telephone apparatus with an automatic answering function
10/09/1990US4962524 Cordless telephone apparatus and a method of controlling same
10/04/1990WO1990011660A1 Switching system for application service
10/04/1990DE3920437C1 Changeover switch circuitry for telephone party line - uses central control unit with microcomputer setting contacts of bistable relays blocking or connecting each subscriber
10/04/1990DE3910485A1 Method for automatic through-connection of a link between two terminals of a telephone system
10/03/1990EP0390597A2 Facsimile apparatus
10/03/1990EP0390333A2 Communications systems
10/03/1990EP0389676A2 Portable communication device
10/03/1990EP0389569A1 Circuit arrangement with adjustable active and/or passive components.
10/03/1990CN2063322U Scrambler for account number of long-distance call
10/03/1990CN2063321U Automatically answering telephone set
10/02/1990US4961223 Shoulder rest for cellular-telephone handset
10/02/1990US4961219 Circuit for synthesizing an impedance across the tip and ring leads of a telephone line circuit
10/02/1990US4961217 Personal-servicing communication system
10/02/1990US4961216 Telephone answering and paging system
10/02/1990US4961212 Voice recognition system used in telephone apparatus
10/02/1990US4961185 Method for controlling a terminal equipment coupled to an integrated services digital network and a terminal equipment based on the same
10/02/1990US4960018 Method of making and using microphones for recording telephone conversations
09/1990
09/30/1990CA2012368A1 Communications systems
09/27/1990DE3909675A1 Barring of DTMF subscriber numbers
09/27/1990DE3909616A1 Device for holding a telephone receiver
09/26/1990CN2062926U Co-line telephone controller
09/25/1990US4959858 Shield device for pushbutton telephone
09/25/1990US4959857 Acoustic calibration arrangement for a voice switched speakerphone
09/25/1990US4959852 Telephone answering machine having solid state and magnetic tape storage for outgoing announcements
09/25/1990US4959851 Dialing features for cellular telephone with standard telephone set
09/25/1990US4959850 Radio telephone apparatus
09/25/1990CA1274630A2 Subscriber unit for wireless digital telephone system
09/23/1990CA2012735A1 Device and method for screening telephone calls
09/20/1990WO1990010987A2 Energy saving protocol for a communication system
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