US PATENT SUBCLASS 340 / 564
.~.~.~.~.~ Fence


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}
561  DF  .~.~.~ Disturbance of electric field {1}
562  DF  .~.~.~.~ Capacitance {2}
564.~.~.~.~.~ Fence


DEFINITION

Classification: 340/564

Fence:

(under subclass 562) Subject matter where the capacitance sensor surrounds the protected area.