Checkpoint Systems, Inc.

Mark J Rankin

Anthony F Piccoli

Gary Thomas Mazoki

Lawrence C Appalucci

John H Bowers

Stanley Tocker

Thomas J McKeown

Luis Francisco Bonnin

Roger Jay Peirce

An electronic system verifies that an article has been tagged with an electronic article surveillance marker. The marker includes a resonant circuit for use in detecting the presence of the article by receiving an interrogation signal and returning a response signal. In the system, the physical presence of an article is detected using an article presence detector which outputs an article presence signal upon physical detection thereof. An interrogation zone is monitored with an interrogator for disturbances in the form of a response signal caused by the presence of a marker within the interrogation zone. The interrogator outputs an interrogator output signal when a marker is detected in the interrogation zone. The article presence signals and the interrogator output signals are received in a processor. 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. The processor outputs either a first or second output signal depending upon whether after an article presence signal is received from a newly physically detected article, the processor receives an interrogator output signal as a result of an interrogation of the newly physically detected article.

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

A resonant tag circuit useful as an electronic security device includes a layered planar structure having a dielectric substrate, a resonant circuit carried on both sides of the dielectric substrate and a semiconductive material having an ionizable salt dissolved therein. The semiconductor material provides a sermiconductive bridge across an activation or deactivation point in the circuit and connects the conductive circuit on both sides of the activation or deactivation point. The resonant tag circuit of this invention is stabilized against premature operation of the activation or deactivation point from electrostatic discharge.

Electronic security tag useful in electronic article indentification and

A security tag used with an electronic article surveillance system for detecting the presence of the tag within a surveilled area utilizing electromagnetic energy at a frequency within a predetermined detection frequency range includes a dielectric substrate having first and second opposing principle surfaces, a peripheral outer edge, and a resonant circuit capable of resonating at a frequency within the predetermined detection frequency range. The security tag also includes a guard member, in one embodiment a discontinuous conductive member, effectively electrically isolated from the resonant circuit, extending along at least a portion of the peripheral outer edge of the substrate for surrounding at least a portion of the resonant circuit. The guard member electrically isolates the resonant circuit to facilitate testing of the resonant circuit during an early stage of the manufacturing process when the resonant circuit is in web form.

Security tag and manufacturing method

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Media, PA, United States of America

Mark J Rankin