US PATENT SUBCLASS 342 / 447
.~.~.~ Having a spiral antennas

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}
447.~.~.~ Having a spiral antennas

DEFINITION

Classification: 342/447

Having a spiral antenna:

(under subclass 417) Subject matter wherein the direction finding receiver is coupled to an antenna which has the form of a helix.