| Patents for H04M 11 - Telephonic communication systems specially adapted for combination with other electrical systems (53,055) |
|---|
| 03/08/1977 | US4011409 Communication system to monitor individual subscribers |
| 02/22/1977 | US4009342 Circuit arrangement for communication facilities wherein transmission paths can be employed for different types of message switching |
| 02/15/1977 | US4008458 Remote automatic reading system |
| 02/15/1977 | US4008369 Telephone interfaced subscription cable television system especially useful in hotels and motels |
| 02/01/1977 | US4006461 System for transmitting operating condition data from a passive station to a central station |
| 01/18/1977 | US4004097 Automatic meter reading device |
| 01/11/1977 | US4002837 Transceiver |
| 01/04/1977 | US4001507 Method and apparatus for telephone systems for facilitating data traffic between the subscriber stations and a central data processor |
| 01/04/1977 | US4001505 Speech signal presence detector |
| 12/21/1976 | US3999017 Telephone apparatus |
| 12/21/1976 | US3999015 Aircraft multi-communications system |
| 12/21/1976 | US3999006 Visitor confirmation system |
| 12/07/1976 | US3996583 System for processing data signals for insertion in television signals |
| 11/30/1976 | US3995217 Method and apparatus for suppressing background noise in a digital telephone system |
| 11/30/1976 | US3995121 Telephone interconnected paging system with dial click to pulse converter |
| 11/16/1976 | US3992587 Remote data line monitor |
| 11/02/1976 | US3989900 Automatic telephone alarm system |
| 11/02/1976 | US3989899 Telephone scheduling system |
| 11/02/1976 | US3989898 Remote monitor signalling system |
| 10/19/1976 | US3987251 Time division switching network for switching multirate multiplexed data |
| 10/19/1976 | US3987247 Data signalling unit for telephone systems |
| 10/19/1976 | US3987246 Apparatus for automatically sending data over a telephone system from a remote station to a central station |
| 10/12/1976 | US3985976 Audio frequency signalling systems for telephone systems |
| 10/12/1976 | US3985959 Key telephone system for subscribers |
| 10/12/1976 | US3985956 Method of and means for detecting voice frequencies in telephone system |
| 10/05/1976 | US3984644 Central dictation system with coded constant current levels for transmission of control signals |
| 10/05/1976 | US3984638 Processor for use between keyboard telephone set and television set |
| 09/14/1976 | US3980831 Data switching system |
| 09/07/1976 | US3979559 Data modem having line verification and automatic disconnect features |
| 08/31/1976 | US3978468 Intercom call signaling mechanism |
| 08/24/1976 | US3976843 MFC receiver digital signal processing |
| 08/24/1976 | US3976840 Portable securities selector system |
| 08/17/1976 | US3975594 Apparatus utilizing a phantom circuit for connecting additional subscribers to a telecommunication system |
| 08/17/1976 | US3975589 Transponder for transmitting data from digital encoding transducers over a telephone line |
| 07/20/1976 | US3970994 Communication switching system |
| 07/13/1976 | US3969584 System for recording the actuation of remotely located locking devices |
| 06/29/1976 | US3967273 Method and apparatus for using pushbutton telephone keys for generation of alpha-numeric information |
| 06/22/1976 | US3965484 Central dictation system |
| 06/08/1976 | US3962546 Malfunction detection and changeover apparatus for data communications system |
| 06/08/1976 | US3962545 Utility meter reading system using telephone line |
| 06/08/1976 | US3962534 Facsimile set |
| 05/04/1976 | US3955051 Data set with bridge for duplex operation |
| 04/27/1976 | US3953685 Multiple-channel dictate station apparatus with automatic release of selected channel |
| 04/20/1976 | US3952167 Electromagnetic coupler for use with a telephone set |
| 04/20/1976 | US3952163 Method and apparatus for testing in FDM system |
| 04/13/1976 | US3950618 System for public opinion research |
| 03/30/1976 | US3947641 Use of public subscriber telephone network; method and apparatus |
| 02/10/1976 | US3938144 Digital multiplexing system remote scanning of a plurality of monitoring points |
| 02/10/1976 | US3937891 Burglar alarm |
| 02/10/1976 | US3937889 Data communication apparatus for use in a telephone system |
| 01/27/1976 | US3935535 Fast equalization acquisition for automatic adaptive digital modem |
| 01/27/1976 | US3935403 Device for developing a neutralization signal for an echo suppressor |
| 01/20/1976 | US3934097 Multifrequency tone detection |
| 01/20/1976 | US3934088 Data terminal for connection to telephone or teleprinter facilities |
| 01/13/1976 | US3932709 Electronic business telephone |