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Article removal control system

  • US 5,260,690 A
  • Filed: 07/02/1992
  • Issued: 11/09/1993
  • Est. Priority Date: 07/02/1992
  • Status: Expired due to Term
First Claim
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1. A responder assembly comprising:

  • a plurality of sensors,means for creating an electromagnetic field within a zone of sensitivity associated with each said sensor, said field being adapted to energize one or more sensitized markers located within said zones which thereby transpond energy for detection by one or more of said sensors, andprocessing means connected to each said sensor for providing a detection pattern corresponding to detection of responded energy from one or more of said sensors, said pattern being processed to determine whether none, one, or more than one of said markers is present within said zones.

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