US PATENT SUBCLASS 340 / 943
.~ Sonic or ultrasonic

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

933  DF  VEHICLE DETECTORS {10}
943.~ Sonic or ultrasonic

DEFINITION

Classification: 340/943

Sonic or ultrasonic:

(under subclass 933) Subject matter wherein the vehicle detector comprises a means for sensing vibrations in the air whether audible or a higher frequency.

SEE OR SEARCH CLASS

367, Communications, Electrical: Acoustic Wave Systems and Devices,

93, and 94 for presence or movement detection.