Method and apparatus for enhancing detection of electronic article surveillance tags in close proximity to electrically conductive objects
Patent 5109217 Issued on April 28, 1992. Estimated Expiration Date: 
August 9, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 9, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3895368 Surveillance method and system with electromagnetic carrier and plural range limiting signals Signal receptor-reradiator and surveillance tag using the same Tag device and method for electronic article surveillance Metal detector coil Electronic article surveillance tag and method for implementing same Patent #: 5030940 InventorsAssigneeApplicationNo. 565369 filed on 08/09/1990US Classes:340/572.1, Detectable device on protected article (e.g., "tag")343/895Spiral or helical typeExaminersPrimary: Swann, III, Glen R.Assistant: Mullen, Thomas J. Jr. Attorney, Agent or FirmInternational ClassesG08B 013/14H01Q 001/36 AbstractA method for detection of EAS tags in a surveillance area into which an electrostatic field is propagated and in which an electronically conductive object is present, includes a step of providing a tag reradiator configuration which is unaffected by close proximity to the object. The step is practiced by configuring the tag reradiator as a first part of a monopole, the object being used as a further part of the monopole, and by disposing the first monopole part beyond the outside perimeter of the conductive environment. The tag reradiator is further configured to define a part of a dipole, the object being used as a further part of the dipole. In an alternative practice, the tag reradiator includes a ground plane member and itself defines such monopole and dipole. In the former practice, the tag reradiator is electrically connected with the object. In the latter practice, the tag reradiator is affixed to the object in electrical isolation therefrom. | |
