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)
04/1990
04/18/1990EP0364383A2 Half-duplex speakerphone
04/18/1990EP0364312A1 Integrated circuit for a subscriber set with a signal envelope detector
04/18/1990EP0363956A2 Information processing apparatus separably combined with telephone unit
04/18/1990EP0363867A2 Recording and play-back device, particularly a telephone answering machine
04/18/1990EP0363492A1 Radio communication system and its control method
04/18/1990EP0363362A1 Telephone subset circuit arrangement
04/17/1990US4918726 Line powered universal telephone amplifier
04/17/1990US4918725 Terminal impedance setting circuit for a two-wire to four-wire converting circuit
04/17/1990US4918724 Coin fraud preventing unit and modular configurations for pay telephone stations
04/17/1990US4918720 Circuit device for controlling the actuated state of an electric appliance
04/17/1990US4917504 Communications headset
04/17/1990CA1267961A1 Multiple access radio telephone system selectively operating on full-duplex and half-duplex modes
04/17/1990CA1267945A1 Rotatable connector
04/12/1990DE3938337A1 Covered junction box for telecommunications - has flange around upper arm of pot-shaped base portion fitted into wall under flush cover
04/12/1990DE3932686A1 Releasing dialling data for computer-controlled telecommunication - using personal computer for direct keying of displayed number of wanted subscriber via interface to line
04/12/1990DE3834261A1 Test device for acoustic measurements
04/12/1990DE3833745A1 Changeover switching device for a number of extensions to be operated on a common subscriber line
04/11/1990EP0362376A1 Mobile telephone
04/11/1990CN2056001U Closed sound-control vibration energy telephone for disaster relief
04/10/1990US4916732 Communication system having telephonic function
04/10/1990US4916731 Device to monitor the content and/or duration of the display of advertisements
04/10/1990US4916730 Telephone answering device with automatic translating machine
04/10/1990US4916726 Telephone answering service with integrated voice and textual message storage
04/10/1990US4915655 Telephone connector
04/10/1990CA1267739A1 Telephone instrument
04/10/1990CA1267737A1 Base station capable of monitoring occurrence of interference on every transmission
04/10/1990CA1267693A1 Portable radio transceiver housing structurally supported by a battery
04/05/1990WO1990003700A1 Telephone answering service with integrated voice and textual message storage
04/04/1990EP0361884A2 Noise reduction in speech transmitter circuits
04/04/1990EP0361496A2 Dialing confirmation tone output apparatus and method
04/04/1990EP0361465A2 Cordless telephone
04/04/1990CN2055656U Automatic double disk telephone
04/04/1990CN2055655U Multifunction wired and radio adapter
04/03/1990US4914696 Communications system with tandem scrambling devices
04/03/1990US4914691 Telephone dialing arrangement
04/03/1990US4914689 Reverse automatic number identification system
04/03/1990US4914687 Voice information transmission system
04/03/1990US4914686 Cordless phone data logger
03/1990
03/28/1990EP0360725A2 Method for application definition of telephone keys
03/28/1990EP0360722A2 Method for monitoring call setup commmunications
03/28/1990EP0360200A2 Communication apparatus utilizing a telephone line
03/28/1990CN2055309U Music unit of telephone handsets
03/28/1990CN1040893A Cordless telephone
03/28/1990CN1007399B Wireless telephone for mine
03/28/1990CN1007391B Casing particularly junction-box casing for telecommunications engineering
03/27/1990US4912759 Device for selectively depressing a telephone switch
03/27/1990US4912758 Full-duplex digital speakerphone
03/27/1990US4912757 Paging system
03/27/1990US4912755 Line current test device
03/27/1990US4912705 Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels
03/27/1990US4912602 Mechanical fastening system for an electronic equipment housing
03/27/1990US4912426 Amplifier circuit
03/27/1990US4911646 Jack security device
03/22/1990WO1990003076A1 Method and apparatus for controlling transmission of voice and data signals
03/22/1990WO1990003075A1 Electronic key for a telephone
03/22/1990WO1990003068A1 Two-way radio communications system having selectable operating modes
03/22/1990DE3831670A1 Microprocessor-controlled operating section
03/22/1990DE3831112A1 Headset for telephone systems
03/21/1990EP0359361A1 Retractable cellular antenna
03/21/1990EP0359327A2 Identity-ROM emulator for Multi Channel Access wireless apparatus
03/21/1990EP0359231A2 Cordless telephone communication system
03/21/1990EP0358885A1 Cover membrane for a circuit carrier
03/21/1990CN2054958U Portable sonic-controlled telephone
03/21/1990CN2054957U Sterilizing soft mat for telephone
03/20/1990US4910767 Impulse pay per view television receiver system for communicating
03/20/1990US4910762 Forewarning of telephone automatic answering device
03/20/1990US4910761 Radio telephone
03/20/1990US4909757 Modular jack patch block
03/20/1990CA1266932A1 Cordless telephone system
03/20/1990CA1266931A1 Method and apparatus for creating and storing telephone directory listings
03/20/1990CA1266930A1 Hybrid alphanumeric telephone directory
03/15/1990DE3829212A1 Inductive coupler for transmitting data via telephone lines
03/14/1990EP0358166A2 Power saving arrangement and power saving method
03/14/1990EP0226610B1 Installation with portable, wireless telephone sets
03/14/1990CN2054598U Infrared ray non-wire telephone set
03/14/1990CN1040472A Communications system with tandem scrambling devices
03/14/1990CN1007198B Telephone set equipped for amplified listening and with an anti-larsen device
03/14/1990CN1007197B Automatic linear compression circuit
03/13/1990US4908853 Dialing apparatus
03/13/1990US4908852 Method and apparatus for altering the access format of telephone calls
03/13/1990US4908849 Telephone answering device capable of repeatedly playing back outgoing message
03/13/1990US4908848 Apparatus for controlling calls in a mobile communication system
03/13/1990US4908847 Adaptor set for converting standard telephone into cordless telephone
03/13/1990US4908845 Audio/telephone communication system for verbally handicapped
03/08/1990DE3829492A1 Device for connecting several telephone sets to one telephone line
03/07/1990EP0357181A2 Method of establishing a radio link in one of a plurality of channels between two radio units
03/07/1990EP0356568A1 Method and apparatus for speaker recognition in a telephone exchange
03/07/1990EP0356567A1 Method and apparatus for speaker recognition in a telephone exchange
03/07/1990CN2054237U Regulating tool for telephone communication distribution equipment
03/06/1990US4907267 Modem interface device
03/06/1990US4907266 Headphone-convertible telephone hand set
03/06/1990US4907265 Telephone set with a mechanism for preventing unwanted displacements
03/06/1990US4907264 Telephone set with subscriber listing
03/06/1990US4907258 Key telephone apparatus
02/1990
02/28/1990EP0355777A2 Communication apparatus for displaying information concerning call receptions
02/28/1990CN2053824U Dual-purpose answering and recording apparatus for call and visit
02/28/1990CN2053823U Surface-contact type cut-off protector for telephone line
02/27/1990US4905276 Telephone earpiece extension attachment
02/27/1990US4905272 PABX cordless telephone system
02/27/1990US4905270 Vehicular hands-free telephone system
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