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Anti-theft protection systems responsive to bath resonance and magnetization

  • US 5,392,028 A
  • Filed: 12/06/1993
  • Issued: 02/21/1995
  • Est. Priority Date: 12/11/1992
  • Status: Expired due to Term
First Claim
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1. The method of protecting articles against theft by means of detection of security labels affixed to the articles upon unauthorized passing through a passageway to trigger an alarm in response thereto, comprising the step of:

  • producing an alarm responsive to the presence of either an unauthorized resonant circuit label or unauthorized magnetizable strip material on an article passing through said passageway.

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