US PATENT SUBCLASS 340 / 552
.~.~.~ Disturbance of electromagnetic waves

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.~.~.~ Disturbance of electromagnetic waves {3}
553  DF  .~.~.~.~> Standing waves
554  DF  .~.~.~.~> Doppler effect
555  DF  .~.~.~.~> Light {1}

DEFINITION

Classification: 340/552

Disturbance of electromagnetic waves:

(under subclass 541) Subject matter responsive to the intruder disturbing electromagnetic waves.

SEE OR SEARCH CLASS

342, Communications: Directive Radio Wave Systems and Devices (e.g., Radar Radio Navigation),

27+, for reflective wave presence detection.