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Class Information
Number: 455/40
Name: Telecommunications > Transmitter and receiver at separate stations > Earth or water medium
Description: Subject matter where the ground (or water) supplies the natural medium for the transmission of the modulated carrier wave between the transmitter and receiver.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7613162 |
Mobile device, system and method for enhanced channel allocation when radio resource connection is released while in dual transfer mode |
Nov. 3, 2009 |
| 7221908 |
Radio communication apparatus |
May. 22, 2007 |
| 7149472 |
Through-the-earth radio |
Dec. 12, 2006 |
| 7050831 |
Through-the-earth communication system |
May. 23, 2006 |
| 7043195 |
Communications system |
May. 9, 2006 |
| 7043204 |
Through-the-earth radio |
May. 9, 2006 |
| 6928301 |
Distributed architecture wireless RF modem |
Aug. 9, 2005 |
| 6766141 |
Remote down-hole well telemetry |
Jul. 20, 2004 |
| 6272349 |
Integrated global positioning system receiver |
Aug. 7, 2001 |
| 6266019 |
System for increasing antenna efficiency |
Jul. 24, 2001 |
| 6263189 |
Narrowband high temperature superconducting receiver for low frequency radio waves |
Jul. 17, 2001 |
| 6085111 |
Telephone and device intended to be adapted to said telephone when operating in restricted mode |
Jul. 4, 2000 |
| 5991602 |
Method of and system for communication between points along a fluid flow |
Nov. 23, 1999 |
| 5794126 |
Emergency positioning indicating radio buoy having a thermally insulated frequency standard |
Aug. 11, 1998 |
| 5737731 |
Method for rapid determination of an assigned region associated with a location on the earth |
Apr. 7, 1998 |
| 5471658 |
Hermetically sealed communication system with rechargeable battery |
Nov. 28, 1995 |
| 5345473 |
Apparatus for providing two-way communication in underground facilities |
Sep. 6, 1994 |
| 5301127 |
High speed method for predicting radio-wave propagation |
Apr. 5, 1994 |
| 5264795 |
System transmitting and receiving digital and analog information for use in locating concealed conductors |
Nov. 23, 1993 |
| 5251326 |
Two way communication system for water sports |
Oct. 5, 1993 |
| 5241410 |
Enhanced infrared-connected telephone system |
Aug. 31, 1993 |
| 5230080 |
Ultra-high frequency communication installation |
Jul. 20, 1993 |
| 5146611 |
Mine communication cable and method for use |
Sep. 8, 1992 |
| 5120904 |
Electrode |
Jun. 9, 1992 |
| 5093929 |
Medium frequency mine communication system |
Mar. 3, 1992 |
| 5087099 |
Long range multiple point wireless control and monitoring system |
Feb. 11, 1992 |
| 4984292 |
Bandpass amplifier and receiver using bandpass amplifier |
Jan. 8, 1991 |
| 4905211 |
Precision doppler effect compensator |
Feb. 27, 1990 |
| 4890334 |
Buoy structure for detecting fishing grounds |
Dec. 26, 1989 |
| 4885797 |
Communication system |
Dec. 5, 1989 |
| 4879755 |
Medium frequency mine communication system |
Nov. 7, 1989 |
| 4870697 |
Two-way communication system for winning machines in underground mining |
Sep. 26, 1989 |
| 4805160 |
Data transmission method for ocean acoustic tomography |
Feb. 14, 1989 |
| 4652857 |
Method and apparatus for transmitting wide-bandwidth frequency signals from mines and other power restricted environments |
Mar. 24, 1987 |
| 4458248 |
Parametric antenna |
Jul. 3, 1984 |
| 4432079 |
Synchronous/asynchronous independent single sideband acoustic telemetry |
Feb. 14, 1984 |
| 4418404 |
Single-sideband acoustic telemetry |
Nov. 29, 1983 |
| 4387372 |
Point gap assembly for a toroidal coupled telemetry system |
Jun. 7, 1983 |
| 4363137 |
Wireless telemetry with magnetic induction field |
Dec. 7, 1982 |
| 4302757 |
Bore telemetry channel of increased capacity |
Nov. 24, 1981 |
| 4276624 |
Acoustic transmission system |
Jun. 30, 1981 |
| 4240061 |
Devices for the measurement of the physical state of a pneumatic tire |
Dec. 16, 1980 |
| 4211980 |
Method of creating an electric field for shark repellent |
Jul. 8, 1980 |
| 4207568 |
Underwater communications system |
Jun. 10, 1980 |
| 4165487 |
Low power system and method for communicating audio information to patrons having portable radio receivers |
Aug. 21, 1979 |
| 4163977 |
Double loop receiver-transmitter combination |
Aug. 7, 1979 |
| 4088998 |
System for detecting nuclear explosions |
May. 9, 1978 |
| 4087781 |
Electromagnetic lithosphere telemetry system |
May. 2, 1978 |
| 4086504 |
Distributed data acquisition |
Apr. 25, 1978 |
| 4030032 |
Radio transmission system |
Jun. 14, 1977 |
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