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Economic, multi-directionally responsive marker for use in electronic article surveillance systems

  • US 4,829,288 A
  • Filed: 11/30/1987
  • Issued: 05/09/1989
  • Est. Priority Date: 11/30/1987
  • Status: Expired due to Term
First Claim
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1. A marker for use in an electronic article surveillance system of the type in which an alternating magnetic field in an interrogation zone produces remotely detectable magnetization changes in the marker, wherein the marker comprises at least two pairs of strips of a high permeability, low coercive force, magnetic material, both pairs of strips being positioned in substantially the same plane, with the strips of each pair being positioned to be substantially parallel to each other and intersecting with the strips of the other pair and dimensioned so as to overlap and be magnetically coupled therewith, the extent of such overlap being such that less than 25% of the length of each strip extends beyond the side of an intersecting strip of another pair, the strips of a first pair thereby forming flux collectors to concentrate flux from fields extending substantially parallel to the strips of the second pair into the strips of the second pair.

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