Patents
Sitemap › H04 - Electric communication technique › H04M - Telephonic communication › H04M 11 - Telephonic communication systems specially adapted for combination with other electrical systems
Patents for H04M 11 - Telephonic communication systems specially adapted for combination with other electrical systems (53,055)
12/1981
12/29/1981US4308430 Apparatus for signalling system
12/22/1981US4307266 Communication apparatus for the handicapped
12/22/1981CA1114942A1 Bidirectional telewriting system operating in an alternating mode over a single carrier
12/16/1981EP0041902A1 Method and device to establish bidirectional and/or multidirectional communications between different persons grouped in different geographically distant locations connected to each other by telephone lines
12/15/1981US4306116 Communications unit for voice and data
12/08/1981US4304970 Telephone status monitor apparatus
12/08/1981US4304967 Remote control apparatus
12/08/1981CA1114083A1 Picture/audio information transmission system
12/01/1981US4303998 Dictation recording system
12/01/1981US4303802 Monitoring system using telephone circuit
12/01/1981US4303801 Apparatus for monitoring and signalling system
12/01/1981CA1113403A2 Programmed conversation recording system
11/1981
11/24/1981US4302629 Digital data transmission system
11/17/1981US4301515 Variable timing system
11/11/1981EP0039624A1 Data communication system
11/10/1981CA1112380A1 Picture/audio signal transmission system
10/1981
10/29/1981WO1981003095A1 Digital subscriber communication system
10/27/1981CA1111582A1 Signal processor for use with a telephone system and a digital transmission system
10/15/1981WO1981002962A1 Electrical supervisory control and data acquisition system
10/15/1981WO1981002960A1 Control unit for automatic meter reading system
10/15/1981WO1981002958A1 Terminal unit for automatic meter reading system
10/14/1981EP0037573A1 Automatic telephonic message transmitting apparatus
10/13/1981US4295208 Signalling system including apparatus for generating and testing data and command words within first and second message intervals
10/13/1981US4295207 Data processing apparatus for receiving and decoding words in which data is encoded by phase reversals or non-phase reversals of a signal of a predetermined frequency
10/13/1981US4295139 Method for transmitting airport weather information
10/13/1981CA1110550A2 Transcribing system and method
10/13/1981CA1110549A2 Recording system and method
09/1981
09/22/1981US4291200 Voice and data switching arrangement
09/22/1981US4291198 General-purpose electronic telephone station set
09/17/1981WO1981002657A1 Communication system
09/15/1981US4289930 Electronic apparatus for the display of information received over a line
09/08/1981US4288868 Satellite communication system for speech and telegraphy
09/08/1981US4288664 Neutralization signal developing device for an echo suppressor
09/08/1981US4288662 Circuit arrangement for telephone exchange systems, especially subscriber extension station installations, with additional data traffic, for example with teleprinter equipment
09/08/1981US4288661 Interface circuitry for acoustic coupler compensation
09/02/1981EP0034610A1 Telephone line data isolator
09/01/1981US4287591 Communications transmission system
09/01/1981US4287567 High speed central office scanner
09/01/1981CA1108325A1 Telecommunications system
08/1981
08/26/1981EP0034514A1 Time division switching installation for lines carrying voice and data packets
08/19/1981EP0033821A2 Intelligent interfacing apparatus for the automatic management of a switched or dedicated telecommunication line
08/19/1981EP0033758A1 Emergency calling system
08/18/1981US4284849 Monitoring and signalling system
08/18/1981CA1107419A2 System for transmitting alarm information over telephone lines
08/12/1981EP0033591A1 Improvements in or relating to data transmission systems
08/11/1981CA1106988A1 Key telephone system paging lockout circuit
08/11/1981CA1106987A1 Gauging system providing remote readout of liquid levels in gasoline storage tanks
08/11/1981CA1106977A1 Microprogrammed unit for a data set incorporating a modem for use at a data transmission terminal and an associated exchange of a data network
08/11/1981CA1106766A1 Simultaneous interpretation apparatus
08/05/1981EP0032982A1 Domestic installation for information transmission and application of the installation as interphone system or for activating an alarm
07/1981
07/23/1981WO1981002085A1 System for remote monitoring and data transmission over non-dedicated telephone lines
07/23/1981WO1981002082A1 Method of automatic switching in a communication network and switching centre therefor
07/22/1981EP0032410A1 Telephonic betting system for lotto or other authorized games of chance
07/14/1981US4278841 Multiple station temperature monitor system
07/07/1981US4277646 Apparatus and method for resetting data sets
07/07/1981CA1104698A1 Automatic telephone exchange system capable of communication of speech signals and data transfer
07/07/1981CA1104505A1 Central control system
06/1981
06/24/1981EP0030708A1 Switching system with paging function
06/16/1981US4273961 Apparatus for communicating with processing apparatus over a telephone network
06/16/1981US4273960 Apparatus for monitoring usage of a telephone
06/09/1981US4272813 Communicating typewriter and dictation system utilizing analog recording and transmission techniques
06/02/1981US4271499 Method and apparatus for digitally implementing a linked compressor-expander telecommunications system
06/02/1981CA1102460A1 Central station system including alternative signal path through commercial telephone network
06/02/1981CA1102421A1 Security controlled information exchange system
05/1981
05/27/1981EP0029246A1 System for the broadcast of information by means of the telephone network
05/27/1981EP0029209A1 Circuitry for storing information in data transmission technique subscriber posts
05/19/1981US4268721 Portable telephone communication device for the hearing impaired
05/12/1981US4267406 Apparatus utilizing portions of a conventional telephone installation for selectively controlling electrically operated, temperature regulating equipment
05/12/1981CA1101074A1 System for transmitting service communications
05/05/1981US4266097 Device control system
05/05/1981CA1100650A2 System for transmitting alarm information over telephone lines
04/1981
04/14/1981US4262283 System for transmitting alarm information over telephone lines
04/07/1981US4260854 Rapid simultaneous multiple access information storage and retrieval system
04/01/1981EP0026020A1 Telephone set
03/1981
03/31/1981US4259548 Apparatus for monitoring and signalling system
03/24/1981US4258387 Video telephone
03/24/1981US4258386 Television audience measuring system
03/24/1981US4258357 Alarm signalling systems
03/05/1981WO1981000658A1 Telephone line data isolator
03/03/1981US4254307 Sequential encoding and decoding apparatus for providing identification signals to a dictation recorder
03/03/1981US4254304 Signal processor for use with a telephone system and a digital transmission line
02/1981
02/24/1981US4253157 Data access system wherein subscriber terminals gain access to a data bank by telephone lines
02/24/1981US4252997 Circuit for interfacing non-dial telephone and automatic switch equipment
02/24/1981CA1096520A1 System for transmitting alarm information over telephone lines
02/17/1981US4251691 Picture/audio signal transmission system
02/17/1981CA1095835A1 Dictation recording system
02/11/1981EP0023692A1 Circuit arrangement for connecting a transmission device of a modem to a telephone line
02/11/1981EP0023691A1 Circuit arrangement for connecting a modem to a telephone line
02/10/1981US4250352 Remote station monitoring system
02/03/1981US4249206 Audio and visual intercommunication and surveillance system
02/03/1981US4249040 Telephone communication control system
02/03/1981US4249036 Remote alarm installation
02/03/1981CA1095193A1 Multiplexing
01/1981
01/27/1981CA1094643A1 Duplex data tansmission modem utilizing an injected tone for shifting power within the transmit spectrum
01/20/1981US4246442 Method and device for confirming correct connection between data terminals in data communication system using telephone network
01/13/1981CA1093698A1 Arrangement for simultaneous two-way data transmission over two-wire circuits
01/07/1981EP0021544A1 System for the remote testing of a modem for a speed of transmission different from the speed of reception
01/07/1981EP0021425A1 Method and devices for signalling emergency calls and starting first aid measures
01/07/1981EP0020878A1 Service integrated information transmission and switching system for sound, picture and data
01/07/1981EP0020506A1 Subscription system using a plurality of terminals
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