US PATENT SUBCLASS 367 / 99
.~ Distance or direction finding

Current as of: June, 1999
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367 /   HD   COMMUNICATIONS, ELECTRICAL: ACOUSTIC WAVE SYSTEMS AND DEVICES

87  DF  ECHO SYSTEMS {6}
99.~ Distance or direction finding {5}
100  DF  .~.~> With correlation or matched filtering
101  DF  .~.~> Frequency modulation {1}
103  DF  .~.~> With beam steering, scanning, or focussing {2}
106  DF  .~.~> With towing
107  DF  .~.~> With indicator {9}

DEFINITION

Classification: 367/99

Distance or direction finding:

(under subclass 87) Subject matter in which the extent of linear and/or relative angular spacing between an acoustic wave reflector and receiver is determined.

SEE OR SEARCH CLASS

340, Communications: Electrical,

621, for acoustic wave liquid level alarms.