US PATENT SUBCLASS 340 / 555
.~.~.~.~ Light

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}
555.~.~.~.~ Light {1}
556  DF  .~.~.~.~.~> Beam {1}

DEFINITION

Classification: 340/555

Light:

(under subclass 552) Subject matter wherein the electromagnetic waves are in the visible range (4,000-7,000A).

SEE OR SEARCH CLASS

250, Radiant Energy,

221+, for photocell systems responsive to animate or

inanimate objects.