Patent ID: 6028518
Filing Date: 2000-02-22
Classification: G08B

Abstract:
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.