US PATENT SUBCLASS 367 / 94
.~.~ By doppler effect

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

87  DF  ECHO SYSTEMS {6}
93  DF  .~ Presence or movement only detection {1}
94.~.~ By doppler effect

DEFINITION

Classification: 367/94

By doppler effect:

(under subclass 93) Subject matter wherein the frequency shift of the received signal is utilized to determine presence or movement.