Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1997-09-30
1999-04-13
Mullen, Thomas
Communications: electrical
Condition responsive indicating system
Specific condition
34082554, G08B 1314
Patent
active
058942700
ABSTRACT:
The present invention relates to an apparatus for the surveillance of an electronic security element in an interrogation zone, comprising a transmitting device emitting at least one cyclic interrogation signal into the interrogation zone, with the interrogation signal causing the security element to deliver a characteristic signal, a receiving device receiving the characteristic signal, and a computing/control unit evaluating the signals received from the receive device and producing an alarm when the presence of the security element is established.
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Clancy Terry
Stocks David
Esselte Meto International GmbH
Mullen Thomas
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