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Flexible ferromagnetic marker for the detection of objects having markers secured thereto

  • US 4,581,524 A
  • Filed: 04/26/1983
  • Issued: 04/08/1986
  • Est. Priority Date: 04/26/1983
  • Status: Expired due to Term
First Claim
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1. A marker adapted for use in an electromagnetic article surveillance system wherein said marker generates a detectable signal related to an alternating electromagnetic field applied within an interrogation zone, said marker comprisingan elongated section of a ferromagnetic amorphous metal having a ratio of length to square root of cross-sectional area of at least 150, sealed on all major surfaces between cover layers of substantially continuous and flexible polymeric material in the range of 0.025 to 0.3 mm thick, said polymeric material exhibiting at temperatures up to 85°

  • C. a rate of water-vapor transmission and degrees of hydrolytic stability and puncture resistance sufficient to enable the marker to be subjected to at least fifty commercial laundrying cycles without appreciable change in those parameters, while also having a high degree of conformability and drapeability so as to enable the marker to be affixed to or inserted in cloth of fabric articles without appreciable stiffening of the articles.

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