US PATENT SUBCLASS 370 / 277
.~ Communication over free space
Current as of:
June, 1999
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370 /
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MULTIPLEX COMMUNICATIONS
276
DF
DUPLEX
{6}
277
.~ Communication over free space {4}
278
DF
.~.~
> Transmit/receive interaction control
279
DF
.~.~
> Duplex repeaters
280
DF
.~.~
> Time division
281
DF
.~.~
> Frequency division
DEFINITION
Classification: 370/277
Communication over free space:
(under subclass 276) Subject matter wherein multiplex communication signals are transmitted over a medium which is not a wire or a waveguide.
(1) Note. A waveguide may be used in this communication system for other purpose (e.g., for coupling).
SEE OR SEARCH CLASS
359, Optics: Systems (Including Communication) and Elements,
113+, for duplex and subclasses 115+ for multiplex optical communication which includes an optical waveguide.
375, Pulse or Digital Communications, appropriate subclasses for digital communications not limited to multiplex communications.
455, Telecommunications, appropriate subclasses for nonmultiplex radio communications.
