US PATENT SUBCLASS 375 / 218
EARTH OR WATER MEDIUM

Current as of: June, 1999
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375 /   HD   PULSE OR DIGITAL COMMUNICATIONS

218EARTH OR WATER MEDIUM

DEFINITION

Classification: 375/218

EARTH OR WATER MEDIUM:

(under the class definition) Subject matter where the ground or water supplies the natural medium for the transmission of pulse or digital signals.

(1) Note. The subject matter of this subclass has a specific underground or underwater structure at each station.

SEE OR SEARCH CLASS

343, Communications, Radio Wave Antennas,

719, for antenna systems buried underground or submerged underwater.

367, Communications, Electrical: Acoustic Wave Systems and Devices,

141+, for signal transducers under water type. 455, Telecommunications,

40, for analog communications via an earth or water medium.