US PATENT SUBCLASS 340 / 554
.~.~.~.~ Doppler effect

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

500  DF  CONDITION RESPONSIVE INDICATING SYSTEM {6}
540  DF  .~ Specific condition {18}
541  DF  .~.~ Intrusion detection {8}
552  DF  .~.~.~ Disturbance of electromagnetic waves {3}
554.~.~.~.~ Doppler effect

DEFINITION

Classification: 340/554

Doppler effect:

(under subclass 552) Subject matter responsive to the frequency change of a reflected electromagnetic wave caused by motion of a reflecting object.