US PATENT SUBCLASS 342 / 422
.~.~.~ With self-orienting antenna pattern

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

350  DF  DIRECTIVE {10}
385  DF  .~ Beacon or receiver {2}
417  DF  .~.~ Direction-finding receiver only {14}
422.~.~.~ With self-orienting antenna pattern {4}
423  DF  .~.~.~.~> Plural antennas {1}
425  DF  .~.~.~.~> Conical scan antenna type
426  DF  .~.~.~.~> Step track antenna type
427  DF  .~.~.~.~> Monopulse or pseuodo monopulse tracking antenna type

DEFINITION

Classification: 342/422

With self-orienting antenna pattern:

(under subclass 417) Subject matter wherein the receiver automatically alters its directional characteristic to coincide with the line of travel of selected radio waves.