Anti-theft security device and perimeter detection system

  • US 9,165,446 B2
  • Filed: 08/20/2013
  • Issued: 10/20/2015
  • Est. Priority Date: 07/27/2005
  • Status: Active Grant
First Claim
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1. A security tag comprising:

  • a housing securable to an object;

    a tamper circuit disposed within the housing;

    a monitoring device movably coupled to the housing for monitoring whether a party removes or attempts to remove the housing from the object, the monitoring device having a first end and a second end, wherein the first end is covered by the housing and the second end extending through an opening in the housing and adapted to releasably contact the object, wherein the monitoring device is movable relative to the housing between at least a first axial position and a second axial position, wherein in the first axial position the monitoring device causes the tamper circuit to be in a closed condition and wherein in the second axial position the monitoring device causes the tamper circuit to be in an open condition;

    a transmitter;

    a microprocessor disposed in the housing and in communication with the tamper circuit and the transmitter, wherein the microprocessor determines whether the security tag is in an unauthorized removal state or an authorized removal state and causes the transmitter to transmit a tamper signal when the security tag is in the unauthorized removal state and the tamper circuit is in the open condition.

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