Anti-theft protection systems responsive to bath resonance and magnetization
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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Accused Products
Abstract
Tagged articles are protected against theft by a system responding to articles having affixed thereto both a resonant circuit and a magnetizable strip. In one embodiment, a label alarm detector responds only to the presence of a resonant circuit or alternatively, only to the presence of a magnetizable strip. In a further embodiment, a label alarm detector responds to both presence of a resonant circuit and presence of a magnetizable strip.
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Citations
9 Claims
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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. - View Dependent Claims (2, 3, 4)
- 5. An article for triggering an alarm upon an unauthorized passing through a passageway having an alarm circuit responsive to detect the presence of only one of a resonant circuit and a magnetizable strip, said article comprising in combination, both a resonant circuit and a magnetizable strip material security device affixed to the article.
Specification