US PATENT SUBCLASS 340 / 556
.~.~.~.~.~ Beam

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  DF  .~.~.~.~ Light {1}
556.~.~.~.~.~ Beam {1}
557  DF  .~.~.~.~.~.~> Laser

DEFINITION

Classification: 340/556

Beam:

(under subclass 555) Subject matter wherein the light is gathered and directed into substantially parallel rays.

(1) Note. The light is generally gathered into one or more groupings, each having a relatively small cross-sectional area with respect to the dimensions of the protected area.