US PATENT SUBCLASS 367 / 93
.~ Presence or movement only detection

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

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

DEFINITION

Classification: 367/93

Presence or movement only detection:

(under subclass 87) Subject matter which determines that a stationary or moving object is within a given area but does not determine the object's specific distance or direction from the detecting station.

SEE OR SEARCH THIS CLASS, SUBCLASS:

99+, for distance or direction finding echo systems.