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)
03/1987
03/24/1987US4652859 Alarm reporting system
03/24/1987CA1219663A1 Data call transfer
03/18/1987EP0214915A2 Information collecting and forwarding apparatus and method of operating such an apparatus
03/18/1987EP0214456A1 Circuit arrangement for connecting a data terminal to a transmission line connected to a telephone device
03/18/1987EP0214347A1 Interactive educational system with voice reaction and access using tone-generating telephone
03/18/1987EP0113347B1 Remote control device through the telephone network
03/17/1987US4651339 Multi-subscriber warning system
03/17/1987US4650927 Processor-assisted communication system using tone-generating telephones
03/12/1987DE3531078A1 Data transmission outside the voice band on two-wire lines
03/11/1987CN86205375U Broadcast and telephone automatic switching apparatus
03/10/1987US4649563 Method of and means for accessing computerized data bases utilizing a touch-tone telephone instrument
03/10/1987US4649533 Method and apparatus for retrieving remotely located information
03/10/1987US4649385 Electronic locating system for persons receiving telephone calls
03/04/1987EP0212947A2 Automatic personnel monitoring system
03/04/1987EP0211849A1 Pager system and communication protocol.
03/03/1987US4647914 Security apparatus and system
02/1987
02/26/1987WO1987001256A1 Telephone and demodulator
02/26/1987DE3634846A1 Device for carrying out direct telephone calls
02/24/1987US4646343 Robbery-repelling alarm system
02/24/1987US4646289 Signal multiplexing circuit
02/24/1987US4645873 Transactional telecommunication system
02/19/1987DE3528281A1 Circuit arrangement for transmitting communications signals
02/17/1987US4644527 Interface unit for transferring voice and data signals
02/17/1987US4644104 Security system including a plurality of centrally programmable locking assemblies
02/17/1987US4644103 Tone-responsive circuit for activating an instrumentality interfacing system
02/17/1987CA1218171A1 Personal-calling communication system
02/12/1987WO1987001002A1 Electronic information dissemination system
02/10/1987US4642805 Digital link for telephone station sets
02/10/1987US4642635 Remote meter reading system
02/10/1987US4642425 Telephone paging system and method
02/10/1987CA1217832A Digital communication system
02/05/1987DE3624705A1 Data transmission device
02/04/1987EP0210889A1 High-security modular monitoring and alarm centre and operating method therefor
02/04/1987EP0210799A2 Access port clock synchronizer
02/04/1987EP0210798A2 Programmable data-routing multiplexer
02/04/1987EP0210596A2 Methods of installing and assigning control processors in a distributed-control communications system
02/03/1987US4641133 Communication apparatus which alerts operator to preset automatic operation
02/03/1987US4641127 Security and fire protection system
02/03/1987US4640989 Communications unit for executive work station
02/03/1987US4640988 Telephone interrupter
01/1987
01/27/1987US4639553 Call signal detecting device
01/27/1987CA1217287A1 Process and a device for franking mail
01/27/1987CA1217265A1 Videotex system with public terminals
01/21/1987EP0209441A1 Transcoding method of a video text image to render it compatible with several video text systems
01/21/1987EP0208959A1 Communication system
01/20/1987CA1216977A1 Multiplexer system
01/15/1987WO1987000378A1 Entrance telephone system utilizing the public subscriber telephone network
01/15/1987WO1987000375A1 Statistical analysis system for use with public communication facility
01/15/1987DE3521495A1 Videotex subscriber station
01/14/1987EP0208501A1 Wideband digital signal distribution system
01/14/1987EP0208231A1 Telecontrol system for postage meters
01/14/1987EP0208080A1 Personal alarm system providing handsfree operation
01/07/1987EP0207468A2 Method and user terminal for videotex
01/06/1987US4635253 Exchange system including plural terminals for voice and data transmission
12/1986
12/31/1986WO1986007659A1 Telephone line interface circuitry for telecommunications equipment
12/30/1986EP0206111A1 Digital local switching system
12/24/1986CN85103135A Circuit of telephone bell with electronic music
12/17/1986EP0205401A2 Tone-responsive circuit for activating an instrumentality interfacing system
12/16/1986CA1215482A1 Simultaneous transmission of speech and data over an analog channel
12/10/1986EP0204155A1 Modem with power-off ring detection
12/10/1986EP0203913A1 Control apparatus
12/10/1986CN86202100U Remote multiple data communication system for partial net
12/04/1986WO1986007223A1 Ensemble modem structure for imperfect transmission media
12/04/1986WO1986007222A1 Meter interface unit for utility meter reading system
12/03/1986EP0203394A2 Electronic music/voice ringer circuit for telephone
12/02/1986US4626623 Method and apparatus for telephone access security
11/1986
11/26/1986EP0202408A2 A paging system, particularly for hotels
11/26/1986EP0202248A1 Communication system
11/26/1986CN86103406A Ensemble modem structure for imperfect transmission media
11/20/1986WO1986006912A1 Method and apparatus for simultaneously displaying plurality of characters and graphic data on multi-screen display on terminal side in communications system
11/20/1986WO1986006911A1 Method and apparatus for displaying character and graphic data simultaneously with video data on single display on terminal side in communications system
11/18/1986US4623988 Apparatus for monitoring and displaying activity of an information processing system
11/18/1986US4623758 Hybrid system for recording voice and data signals
11/18/1986CA1214292A1 Portable device for monitoring local area
11/12/1986CN86102295A Method and apparatus for data communication
11/12/1986CN85103369A Baseband local area network using ordinary telephone wiring
11/04/1986US4621350 Recording and dictation system
10/1986
10/29/1986EP0199268A2 System for representing pictures, graphic designs and/or text on the screen of a display unit
10/29/1986EP0198913A1 Call unit for use in an emergency call system
10/28/1986US4620064 Pocket sized telephone line data communication systems
10/22/1986EP0198411A2 Ringing device
10/22/1986EP0198396A2 Method and apparatus for data communication
10/22/1986EP0198161A1 Method for emphasizing sharpness in a picture signal reproducing machine
10/22/1986EP0198079A1 Call responsive computer power switching device
10/21/1986US4618742 Method and apparatus for decoding audiofrequency information sent through rotary dialing
10/15/1986CN86100949A Subscriber rf telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of rf channels
10/14/1986CA1212792A1 Method of and apparatus for voice communication storage and forwarding with simultaneous access to multiple users
10/14/1986CA1212747A1 Voice and data combining and pabx incorporating same
10/08/1986EP0196936A1 Apparatus for quick automatic testing, especially of telephone directory terminals
10/08/1986EP0196815A2 Personal computer note-taking facility
10/08/1986EP0196781A2 Method & apparatus for automatically transmitting a message to a telephone terminal
10/08/1986EP0196660A2 Enhanced videotex decoder apparatus
10/08/1986EP0196371A2 Method for the wireless transmission of a call signal
10/07/1986US4616263 Video subsystem for a hybrid videotex facility
10/01/1986EP0196191A2 Method and apparatus for transforming prestel codes to naplps codes
09/1986
09/25/1986WO1986005650A1 Combined voice/data telephone system
09/25/1986WO1986005640A1 Telephone system and method for transmitting digital information
09/24/1986EP0195272A2 Voice mail system on audio tape
09/24/1986EP0195092A1 Picture transmitting intercom apparatus for wall mounted installations, having improved fastening means and a circuitry laid on compact size moulded supports
09/23/1986CA1211825A1 Telecommunication system for transmitting data information by means of a digital exchange
1 ... 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 ... 531