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)
04/1991
04/23/1991US5010575 Audio current pick-up device
04/23/1991US5010570 Method for active feedback suppression
04/23/1991US5010567 Recorder control apparatus for automatic telephone answering system
04/23/1991US5010566 Cordless telephone
04/23/1991US5010565 Apparatus and method for adding cordless handset capability to an existing corded telephone
04/23/1991CA1283457C Method and apparatus for controlling the frequency of operation and at least one further variable operating parameter of a radio communications device
04/18/1991WO1990010987A3 Energy saving protocol for a communication system
04/17/1991EP0422429A2 Cordless telephone with a channel scanning device located both in the mobile and the base stations and with a memory connected to the channel scanning device
04/17/1991EP0422424A2 Electrodynamic transducer
04/17/1991EP0422121A1 Method and apparatus for programming devices to recognize voice commands
04/17/1991CN2075406U Extension arrangement for telephone
04/17/1991CN1012410B Communications system with tandem scrambling devices
04/16/1991US5008933 Automatic sterilizing device of the telephone
04/16/1991US5008932 Adjustable phone handset shoulder support
04/16/1991US5008931 Multi-purpose modular jack connection block
04/16/1991US5008928 Public access facsimile system
04/16/1991US5008927 Computer and telephone apparatus with user friendly computer interface integrity features
04/16/1991US5008924 Telecommunications terminal with improved control functions
04/16/1991US5008900 Subscriber unit for wireless digital subscriber communication system
04/16/1991US5008864 Portable radio telephone device
04/16/1991CA2006506A1 Telephone lock
04/16/1991CA1283231C Branched telephone system
04/16/1991CA1283187C Key management system for open communication environment
04/10/1991EP0421898A1 Telephone handset
04/10/1991EP0421602A2 Hybrid network
04/10/1991CN2074957U Universal parallel telephone automatic converting calling device
04/10/1991CA2027106A1 Electrodynamic transducer
04/09/1991US5007081 Speech activated telephone
04/09/1991US5007079 For anchoring a handset
04/09/1991US5007076 Call announcement arrangement
04/09/1991US5007046 Computer controlled adaptive speakerphone
04/09/1991US5007000 Classification of audio signals on a telephone line
04/09/1991CA1282884C Telephone system with stimulus operation or default operation
04/09/1991CA1282836C Vehicle sun vison telephone
04/04/1991WO1991004461A1 Integrated data transmission computer and system
04/03/1991EP0420204A2 Method for the transmission of subscriber data from one secret subscriber to another in communication exchanges
04/03/1991EP0419948A2 Method for initiating switching-related functions and services
04/03/1991EP0148836B1 Method and apparatus for sending a data message to a selected station during a silent interval between ringing
04/03/1991CN2074519U Connecting arrangement of dial system (c.b. system) telephone set
04/02/1991US5005199 To be carried and used on the person
04/02/1991US5005198 Cordless telephone apparatus
04/02/1991US5005150 Digital signal processors
04/02/1991CA1282511C Voice control circuit for a communication terminal
04/02/1991CA1282510C Mass-distributed, preprogrammed automatic dialing mechanism and related processes
04/02/1991CA1282506C Multiplexed data channel controlled telephone system
04/02/1991CA1282489C Telephone receiver adaptor
03/1991
03/28/1991DE3930927A1 Telephone cradle fork switch - has step at lever shifter interface to compensate for cradle and switch movement difference
03/28/1991DE3930869A1 Telephone set with simplified selection of numbers - uses scanner for memory with store numbers, capable of charging calls to scanner owners number
03/27/1991EP0419363A1 Pulse dialling device for an apparatus connected to a telephone line
03/27/1991EP0418351A1 Telephone.
03/27/1991EP0418282A1 Portable call generator
03/27/1991CN1050297A Method and apparatus for keyboard adaptation to low power controller in coin operated telephone
03/27/1991CN1050296A Method and apparatus for retrofitting standard coin operated telephone employing carbon microphone with line powered electronic controller
03/27/1991CN1050295A Method and apparatus for preventing pay telephone fraud and reducing handset vandalism
03/26/1991US5003589 Headphone-convertible telephone handset
03/26/1991US5003587 Telephone on-hold device
03/26/1991US5003586 Dial tone interrupt device
03/26/1991US5003581 Telephone line priority sharing device
03/26/1991US5003580 Adapter for interfacing a work station terminal to a key telephone system
03/26/1991US5003576 Analog/digital voice storage cellular telephone
03/26/1991US5003573 Self-diagnosis of loop start and ground start trunk interfaces
03/20/1991EP0417979A2 Method and apparatus for preventing pay telephone fraud and reducing handset vandalism
03/20/1991EP0417978A2 Method and apparatus for retrofitting a standard coin operated telephone employing a carbon microphone with a line powered electronic controller
03/20/1991EP0417977A2 Method and apparatus for keyboard adaptation to a low power controller in a coin operated telephone
03/20/1991EP0417788A2 Communication terminal having means for controlling power transfer
03/20/1991EP0417362A1 Data/facsimile telephone subset apparatus incorporating electrophoretic display
03/20/1991EP0363362A4 Telephone subset circuit arrangement
03/20/1991CN2073633U New type of extension telephone
03/20/1991CN1012121B Volume range control circuit
03/20/1991CN1012120B Telephone having receive call indicating function and mute/light key
03/19/1991US5001772 Power pack with concealed radio transmitter for portable cellular telephone
03/19/1991US5001746 Transmission control unit
03/19/1991US5001743 Method and apparatus for controlling a telephone answering device
03/19/1991US5001709 Communication system and apparatus
03/19/1991CA1281809C Parallel rays lens for optical telephone
03/19/1991CA1281777C Detachable battery pack with a built-in broadband antenna
03/16/1991WO1991004628A1 Line powered electronic controller
03/16/1991WO1991004627A1 Method and apparatus for preventing pay telephone fraud and reducing handset vandalism
03/16/1991WO1991004626A1 Keyboard adaptation to low power controller in a coin telephone
03/13/1991EP0416598A2 Facsimile apparatus
03/13/1991EP0416129A1 Switching system for application service
03/12/1991CA1281445C Telephone
03/12/1991CA1281443C System allowing selective connection of various types of external apparatuses to telephone set
03/07/1991WO1991003136A1 Method of, and primary station for, operating a telephone system
03/07/1991DE3928957A1 Junction box for connection of telephones and accessories - has portion of cover adapted as flexible key for operation of latch to release inserted plug
03/07/1991DE3928743A1 Overvoltage protection for electronic telephone station - has transistors in microprocessor-controlled circuit arranged to function as switch and limiter
03/06/1991EP0415503A1 Integrated circuit with detection of the saturation state
03/05/1991US4998291 Radio telephone apparatus
03/05/1991US4998277 Telephone hanger for hospital bed
03/05/1991US4998276 Dial signal generator for generating dial pulse signal and dual tone multi-frequency signal
03/05/1991US4998274 ISDN dual bus extension phone system
03/05/1991US4998273 Telephone line called number recognizer
03/05/1991US4998272 Touch tone telephone
03/05/1991US4998271 Telephone accessory
03/01/1991WO1991003884A1 Battery saver for a tdm system
02/1991
02/28/1991DE3928298A1 Preventing eaves-dropping at telephone subscribers appts. - incorporating mute button to interrupt microphone current circuit or connecting shunt resistance across microphone
02/27/1991EP0414409A2 Cordless telephone systems
02/27/1991EP0414365A2 Portable radio telephone
02/27/1991EP0414253A2 Holder for electronic fittings in motor vehicles
02/27/1991EP0414051A2 Circuit arrangement for key-controlled switching devices in communication exchanges, especially telephone exchanges
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