US PATENT SUBCLASS 342 / 417
.~.~ Direction-finding receiver only

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.~.~ Direction-finding receiver only {14}
418  DF  .~.~.~> Doppler
419  DF  .~.~.~> Portable
420  DF  .~.~.~> With error or deviatioan compensator or eliminator {1}
422  DF  .~.~.~> With self-orienting antenna pattern {4}
428  DF  .~.~.~> With continuously movable antenna pattern {3}
432  DF  .~.~.~> With plural fixed antenna pattern comparing {5}
441  DF  .~.~.~> Having a goniometer
442  DF  .~.~.~> Having a phase detector
443  DF  .~.~.~> Having a direction indicator
444  DF  .~.~.~> Having plural receivers
445  DF  .~.~.~> Having more than two antennas {1}
447  DF  .~.~.~> Having a spiral antennas
448  DF  .~.~.~> Having a coil or loop type antenna
449  DF  .~.~.~> Having a moving antenna

DEFINITION

Classification: 342/417

Direction-finding receiver only:

(under subclass 385) Subject matter including a receiver station which is capable of determining the time of travel or bearing of the received signals with respect to the station.

SEE OR SEARCH THIS CLASS, SUBCLASS:

147+, for reflected (radar) or otherwise returned radio wave systems which include a direction finding receiver.

386+, for systems under subclass 350 which include a directional transmitting station and a receiving station so that the location of the receiving station in a line or plane with respect to the transmitting station may be determined.

407+, for receivers especially designed to receive a characteristic signal or lack of signals transmitted from one or more beacons, so long as the receiver is maintained within a fixed bearing line or plane.

SEE OR SEARCH CLASS

329, Demodulators, appropriate subclasses for demodulators of modulated wave energy.