| Patents for H04B 13 - Transmission systems characterised by the medium used for transmission, not provided for in groups (1,959) |
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| 06/04/1991 | US5022013 Underwater release apparatus, underwater release system and method |
| 05/28/1991 | US5019822 Marine object detector |
| 04/23/1991 | US5010529 Underwater transmitter apparatus |
| 02/12/1991 | US4992786 Electrical conductor detector |
| 12/04/1990 | US4975890 Underwater sound transmitting system |
| 09/27/1990 | DE3908441A1 The EMKA method |
| 03/27/1990 | US4912464 Anchor alarm for boats and the like |
| 03/22/1990 | WO1990002958A1 Underwater detector |
| 02/27/1990 | US4904993 Remote control apparatus with selectable RF and optical signal transmission |
| 01/23/1990 | CA1264811A1 Well data transmission system using a magnetic drill string for transmitting data as a magnetic flux signal |
| 01/11/1990 | DE3823106A1 Transverse and longitudinal electromagnetic waves according to the Lorenz concept of retarded potentials |
| 07/12/1989 | CN1033896A Mine emergency communication cable and method for use |
| 01/24/1989 | US4800385 Well data transmission system using a magnetic drill string for transmitting data as a magnetic flux signal |
| 01/05/1989 | DE3721224A1 Bio-message system |
| 07/06/1988 | EP0273379A2 Well data transmission system using a magnetic drill string |
| 04/26/1988 | CA1235786A1 Marine seismic streamer coupler |
| 11/19/1987 | EP0245282A1 Optical underwater communicator |
| 10/15/1987 | DE3611077A1 Arrangement for wireless information transmission by means of electromagnetic waves at an extremely low frequency |
| 06/19/1987 | DE3532741A1 Method for S-neutrino telecommunication |
| 05/21/1987 | WO1987003154A1 Optical underwater communicator |
| 04/09/1987 | DE3532165A1 Method for S-neutrino telecommunication |
| 08/12/1986 | US4605897 Apparatus and method for distance determination between a receiving device and a transmitting device utilizing a curl-free magnetic vector potential field |
| 07/08/1986 | US4599745 Hybrid fiber optics and radio frequency telemetry apparatus for acquiring data from an underwater environment |
| 05/27/1986 | US4591854 Touch control identification system with portable encoder |
| 08/07/1984 | US4464660 Multichannel remote transducer monitoring system |
| 05/23/1984 | EP0109184A2 Identification system |
| 05/08/1984 | US4447779 Apparatus and method for determination of a receiving device relative to a transmitting device utilizing a curl-free magnetic vector potential field |
| 02/14/1984 | US4432098 Apparatus and method for transfer of information by means of a curl-free magnetic vector potential field |
| 01/31/1984 | US4429280 Apparatus and method for demodulation of a modulated curl-free magnetic vector potential field |
| 05/24/1983 | CA1147072A1 Electrical communications system |
| 09/14/1982 | US4349913 Method and apparatus for reducing the demand on the number of transferred bits when transferring PCM information |
| 06/22/1982 | US4336537 Bi-directional underwater communication system |
| 04/28/1982 | EP0050523A2 Electromagnetic transmission using a curl-free magnetic vector potential field |
| 03/30/1982 | US4322728 Multichannel remote transducer monitoring system |
| 03/31/1981 | US4259746 Electrical communications system |
| 02/24/1981 | US4252074 Distributed lift system for a cable |
| 07/08/1980 | US4211980 Method of creating an electric field for shark repellent |
| 06/10/1980 | US4207568 Underwater communications system |
| 05/27/1980 | US4205268 Neutrino communication arrangement |
| 05/13/1980 | US4203109 Submarine communication system |
| 02/05/1980 | US4187489 Method and apparatus for propagating electrical signals through a conducting dielectric fluid |
| 01/01/1980 | US4181014 Remote well signalling apparatus and methods |
| 09/18/1979 | CA1062793A1 Signal transmission system |
| 07/26/1979 | WO1979000462A1 A method and an arrangement for reducing the demand on the number of transferred bits when transferring pcm information |
| 07/10/1979 | CA1058089A1 Power line carrier communication system for signaling customer locations through ground wire conductors |
| 02/20/1979 | US4140991 Underwater displacement probe |
| 08/22/1978 | US4109218 Method for the generation of frequency-transferred electromagnetic waves |
| 05/16/1978 | US4090135 Wireless FSK technique for telemetering underground data to the surface |
| 05/09/1978 | US4088998 System for detecting nuclear explosions |
| 11/22/1977 | US4059819 Detector assembly for seismic marine survey |
| 09/27/1977 | US4050819 Undersea ranging-communications from altitude via laser |
| 06/28/1977 | US4032845 Surface wave communication system |
| 06/14/1977 | US4030032 Radio transmission system |
| 04/05/1977 | US4016429 Power line carrier communication system for signaling customer locations through ground wire conductors |
| 03/29/1977 | US4015234 Apparatus for measuring and for wireless transmission of measured values from a bore hole transmitter to a receiver aboveground |
| 08/31/1976 | US3978469 Method and apparatus for communicating in building structures and parts thereof particularly multi-story building |
| 07/20/1976 | US3970936 Telecommunication using muon beams |
| 06/15/1976 | US3964051 Electrostatic communication system |
| 04/20/1976 | US3952155 Water ski tow communication system |