US PATENT SUBCLASS 342 / 30
.~ With transponder

Current as of: June, 1999
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342 /   HD   COMMUNICATIONS: DIRECTIVE RADIO WAVE SYSTEMS AND DEVICES (E.G., RADAR, RADIO NAVIGATION)

29  DF  AIRCRAFT COLLISION AVOIDANCE SYSTEM (CAS) {1}
30.~ With transponder {2}
31  DF  .~.~> Including synchronized clock
32  DF  .~.~> Included in Secondary Surveilance Radar (SSR) or Air Traffic Control Radio Beacon System (ATCRBS)

DEFINITION

Classification: 342/30

With transponder:

(under subclass 29) Subject matter including a radio signal receiver-transmitter to convey the radar signal.

SEE OR SEARCH THIS CLASS, SUBCLASS:

42+, for radar transponder systems, per se.

SEE OR SEARCH CLASS

340, Communications: Electrical,

870.31+, for inductively coupled signal transmitter used in continuously variable indicating systems.

375, Pulse or Digital Communications,

211+, for pulse or digital signal repeaters.

455, Telecommunications,

7+, for carrier wave repeaters.