US PATENT SUBCLASS 455 / 40
.~ Earth or water medium
Current as of:
June, 1999
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455 /
HD
TELECOMMUNICATIONS
39
DF
TRANSMITTER AND RECEIVER AT SEPARATE STATIONS
{14}
40
.~ Earth or water medium
DEFINITION
Classification: 455/40
Earth or water medium:
(under subclass 39) Subject matter where the ground (or water) supplies the natural medium for the transmission of
the modulated carrier wave between the transmitter and receiver.
(1) Note. The subject matter of this subclass has a specific under ground (or underwater) structure at each station.
SEE OR SEARCH CLASS
343, Communications: Radio Wave Antennas,
719, for antenna systems buried underground or submerged underwater.
375, Pulse or Digital Communications,
218, for pulse communication via an earth or water medium.
