Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2008-03-04
2010-06-01
Hofsass, Jeffery (Department: 2612)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S572100, C340S573100
Reexamination Certificate
active
07728725
ABSTRACT:
The present invention is directed to an underground as well as above ground system and method of determining the intrusion into a security zone. One or more transceivers would transmit a unique electromagnetic signal which would power a response from one or more RFID transponders. Each of the transponders would transmit a unique code to the transceiver indicating that there has been no intrusion in the vicinity of that transponder. Failure of a transponder to receive a signal produced by a transponder, would indicate the existence of an intrusion. The transponders as well as the transceivers can be provided in a PVC pipe buried in the ground, or provided in or on a structure located on or above the ground.
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Hoffman Wasson & Gitler
Hofsass Jeffery
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