US PATENT SUBCLASS 342 / 27
PRESENCE DETECTION ONLY

Current as of: June, 1999
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342 /   HD   COMMUNICATIONS: DIRECTIVE RADIO WAVE SYSTEMS AND DEVICES (E.G., RADAR, RADIO NAVIGATION)

27PRESENCE DETECTION ONLY {1}
28  DF  .~> By motion detection

DEFINITION

Classification: 342/27

PRESENCE DETECTION ONLY:

(under the class definition) Subject matter wherein a radar system senses the existence of a target without quantifying any of its characteristics.

SEE OR SEARCH CLASS

340, Communications: Electrical,

541+, for intrusion detection alarm systems.