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Emerging security features for identification documents

  • US 7,213,757 B2
  • Filed: 09/13/2004
  • Issued: 05/08/2007
  • Est. Priority Date: 08/31/2001
  • Status: Expired due to Fees
First Claim
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1. An identification document comprising at least one of a photographic representation of a bearer of said identification document or indicia provided on the document, said identification document further comprising a security feature including:

  • a first set of elements provided on a surface of the identification document by a first ink, the first ink including a first emission decay rate;

    a second set of elements provided on the surface of the identification document by a second ink, the second ink including a second emission decay rate, wherein the first emission decay rate is relatively shorter than the second emission decay rate; and

    whereinthe first set of elements and second set of elements are arranged on the surface of the identification document so as to collectively convey a first pattern when the first ink and the second ink are excited by non-visible light, wherein the second set of elements convey a second pattern that becomes distinguishable as emissions from the first ink decay but before the emissions from the second ink are extinguished.

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