US PATENT SUBCLASS 342 / 416
.~.~.~.~.~ Sequentially effective reflectors

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}
386  DF  .~.~ With transmisson of bearing or position determinative signals {6}
407  DF  .~.~.~ Fixed course or bearing indicating {5}
414  DF  .~.~.~.~ Distinctive frequencies equi-signal type {2}
416.~.~.~.~.~ Sequentially effective reflectors

DEFINITION

Classification: 342/416

Sequentially effective reflectors:

(under subclass 414) Subject matter in which the alteration of the directional patterns is produced by alternating the effectiveness of two reflecting units.