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)
12/1991
12/24/1991US5075894 Telephone message forwarding apparatus
12/24/1991US5075687 Echo suppression with both digital and analog variable attenuators
12/24/1991US5075637 Control circuit for amplified listening
12/24/1991US5074804 Electrical connectors
12/24/1991CA1293545C Telephone modular jack
12/19/1991DE4018685A1 Teilnehmeranschlusseinrichtung fuer ein breitband-kommunikationsnetz Subscriber terminal equipment for a wideband communication network
12/18/1991EP0461572A2 Multifunctional radio apparatus switching between different operation modes
12/18/1991EP0461571A2 Combined radio apparatus, in particular combination of a cordless telephone and a paging receiver
12/18/1991EP0461148A1 Telephone support device.
12/18/1991CN2091046U Clamped telephone protector
12/17/1991US5073932 Secured data transmission and error recovery mechanism in cordless telephones
12/17/1991US5073928 Cordless telephone system having an automatic answering device
12/17/1991US5073927 Imaging identification method for a communication system
12/17/1991US5073924 Telephone line noise filter apparatus
12/17/1991US5073923 Private telephone system with unified command feature
12/17/1991US5073922 Communication terminal apparatus
12/17/1991US5073921 Line connection switching apparatus for connecting communication line in accordance with matching result of speech pattern
12/17/1991US5073919 Automatically testing telephone lines
12/17/1991CA1293300C Car telephone equipment having automatic calling function
12/13/1991CA2018899A1 Bases for telephones
12/12/1991DE4018410A1 Rubber foot connector for base of telephone subscriber's appts. - is disc-shaped with rotation symmetrical recesses from edge region
12/12/1991DE4017988A1 Telephone subscriber's appts with microcomputer - executing period duration and/or frequency position measuring for acoustic signal, from microphone
12/11/1991CN2090596U Sterilizer for telephone
12/11/1991CN1056969A Pronunciation treatmentor with antinoise and process for antinoise
12/10/1991CA1293070C Video and audio communication terminal, particularly a videophone, having a hinged case
12/10/1991CA1293050C Hand set
12/05/1991DE4017763A1 Telephone subscriber appts. with loudspeaking facility - uses external loudspeaker and receiver connected to subscriber socket
12/05/1991DE4017690A1 Telephone handpiece for car radiotelephone - has alphanumeric keyboard with pivoted cover and supporting display elements on its inside face
12/04/1991EP0459488A2 Radio telecommunication apparatus
12/04/1991EP0459467A2 Telephone system for transmitting either a dial pulse or a dual-tone multi-frequency signal along a telephone line
12/04/1991EP0459405A2 Universal telephone handset interface
12/04/1991EP0459346A2 Speaker and microphone unit for motorvehicle-mounted mobile telephone
12/04/1991EP0459344A1 Software download device for a communication terminal
12/04/1991EP0459343A1 Telephone set with adaptable specifications
12/04/1991EP0459181A2 Holder for a circuit board in a telephone set
12/04/1991EP0458813A1 Two-way optical communications system.
12/04/1991CN2090130U Rotary telephone stand
12/04/1991CN1056786A Self-relay mobile telephone
12/03/1991US5070527 Time dependant, variable amplitude threshold output circuit for frequency variant and frequency invarient signal discrimination
12/03/1991US5070524 Telephone system
12/03/1991US5070522 Combined signal and power distribution system
12/01/1991CA2043587A1 Universal telephone handset interface
11/1991
11/28/1991WO1991018492A1 Transceiver mounting assembly having integrally formed lock
11/28/1991WO1991018465A1 Double annular ring speaker gasket
11/28/1991DE4016629A1 Service telephone unit with dual-tone multi-frequency decoder - protects service conversations by provision of engaged tone from internal generator and switch operated by microcontroller
11/27/1991EP0458710A1 Telephone system with a plurality of telephone terminals on a single line
11/27/1991EP0458563A2 A multi-function telephone apparatus
11/27/1991EP0458540A2 Communication apparatus
11/27/1991EP0458046A2 Handset for telephone apparatus
11/27/1991EP0457990A2 Interactive data processing apparatus using a pen
11/27/1991CN1056612A Double annular ring speaker gasket
11/27/1991CN1056610A Telephone set with ball-type dialling structure and plate insertion
11/26/1991US5068890 Combined signal and electrical power distribution system
11/26/1991US5068889 Cordless telephone capable of programming an id code into both a base and cordless remote unit via the cordless remote unit
11/26/1991US5067787 Electro-optical converter
11/26/1991CA1292589C Signal compression circuit, particularly for a telephone set
11/26/1991CA1292587C Cordless telephone system
11/26/1991CA1292585C Ground start circuit
11/26/1991CA1292514C Mechanical fastening system for an electronic equipment housing
11/26/1991CA1292503C Surge protector for telecommunications terminals
11/21/1991EP0457397A1 Circuit for line current regulation in a telephone set
11/21/1991EP0457077A2 Accessing alphanumeric information using a numeric keypad
11/21/1991EP0456968A2 Piezoelectric transducer
11/21/1991DE4016188A1 Caller identification appts. for telephone - uses internal storage of known names and numbers to display caller's name when number is received from digital exchange
11/20/1991CN1014854B Portable radio apparatus
11/19/1991US5067153 Method for transmitting subscriber data in communication systems from one secret subscriber equipment to another
11/19/1991US5067151 Telephone handset with electrostatic discharge prevention
11/19/1991US5067150 Telephone number display device
11/19/1991US5066235 Connector assembly for electronic devices
11/19/1991CA1292336C Cordless telephone with battery saving function
11/19/1991CA1292206C Brief case with a portable wireless telephone
11/14/1991WO1991017619A1 Device for changing over and restoring automatically telephone circuit
11/13/1991EP0456260A2 A dialing system for automatically setting an abbreviated code
11/13/1991EP0455987A2 Communicating apparatus having dual function of a facsimile and a cordless telephone
11/13/1991EP0455863A2 An electrical telephone speech network
11/13/1991CN2088766U Stationery telephone dish
11/13/1991CN2088765U Telephone fork spring double joint resetting switch
11/13/1991CN2088764U Telephone line plug blanking press improved structure
11/12/1991US5065428 Secure mode answering machine
11/12/1991US5065425 Telephone connection arrangement for a personal computer and a device for such an arrangement
11/12/1991US5065309 Personal computer note-taking facility
11/12/1991US5065003 Portable data input/transmission apparatus
11/12/1991US5064162 Portable-telephone mounting bracket
11/12/1991CA1292041C Cellular cordless telephone
11/06/1991EP0455252A2 A radio unit for a telephone set
11/06/1991EP0455157A2 Facsimile apparatus
11/06/1991EP0454828A1 Communications device with movable element control interface.
11/06/1991EP0454814A1 Communications device with voice recognition and movable element control interface
11/06/1991CN2088310U 电话插头 Phone plug
11/06/1991CN1056032A Calling limit circuit for terminal on telephone network
11/06/1991CN1056031A Automatic speech answering messenger calling equipment for telephone
11/05/1991US5063593 Tone-type recognition method
11/05/1991US5063590 Acoustic coupler and data transmission apparatus using the same
11/05/1991US5063589 Automatic telephone answering machine with ring signal responsive mode changing arrangement
11/05/1991US5063584 Method for testing subscriber's equipment
11/05/1991US5063563 Communication terminal having means for controlling power transfer
11/05/1991CA1291805C Wire tap detection device
10/1991
10/31/1991DE4013885A1 Complex impedance model for 2-wire 4-wire interface
10/31/1991DE4013387A1 Telephone system operation - in which main phone is controlled by central controller and extensions can be added by 4-line
10/30/1991EP0454387A2 Data communication apparatus with pre-recorded telephone numbers
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