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System for verifying attachment of an EAS marker to an article after tagging

  • US 6,028,518 A
  • Filed: 06/04/1998
  • Issued: 02/22/2000
  • Est. Priority Date: 06/04/1998
  • Status: Expired due to Term
First Claim
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1. A system for verifying that an article has been tagged with an electronic article surveillance marker, the marker including a resonant circuit for use in detecting the presence of the article by receiving an interrogation signal and returning a response signal, the system comprising:

  • (a) an article presence detector for detecting the physical presence of an article and outputting an article presence signal upon physical detection thereof;

    (b) an interrogation zone;

    (c) an interrogator for monitoring the interrogation zone for disturbances in the form of a response signal caused by the presence of a marker within the interrogation zone which is associated with a physically detected tagged article within the interrogation zone, the interrogator outputting a predetermined output signal when such a marker is detected in the interrogation zone; and

    (d) a processor connected to the article presence detector and the interrogator for receiving respective output signals therefrom, whereby after an article presence signal is received from a newly physically detected article, the processor determines whether an interrogator output signal is received as a result of an interrogation of the newly physically detected article.

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