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Class Information
Number: 375/218
Name: Pulse or digital communications > Earth or water medium
Description: Subject matter where the ground or water supplies the natural medium for the transmission of pulse or digital signals.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7392028 |
Radio receiver/transceiver including an interface circuit selectively operable in a current mode or a voltage mode |
Jun. 24, 2008 |
| 7245656 |
Method of signal acquisition and mobile station using the method |
Jul. 17, 2007 |
| 6856647 |
Methods and systems for neutral-to-ground communication |
Feb. 15, 2005 |
| 6813324 |
Synchronized communication system |
Nov. 2, 2004 |
| 6295312 |
Time diversity transmission for multichannel adaptive equalization |
Sep. 25, 2001 |
| 5493612 |
Secure communication keying system |
Feb. 20, 1996 |
| 5345473 |
Apparatus for providing two-way communication in underground facilities |
Sep. 6, 1994 |
| 4999606 |
Dive parameter indicating assembly |
Mar. 12, 1991 |
| 4949072 |
Dive parameter indicating assembly |
Aug. 14, 1990 |
| 4905211 |
Precision doppler effect compensator |
Feb. 27, 1990 |
| 4792965 |
Oscillator system for detecting a selected one of a plurality of tuned circuits |
Dec. 20, 1988 |
| 4652857 |
Method and apparatus for transmitting wide-bandwidth frequency signals from mines and other power restricted environments |
Mar. 24, 1987 |
| 4428073 |
Underwater depth telemetry |
Jan. 24, 1984 |
| 4302757 |
Bore telemetry channel of increased capacity |
Nov. 24, 1981 |
| 4090135 |
Wireless FSK technique for telemetering underground data to the surface |
May. 16, 1978 |
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