Patent ID: 7213757
Filing Date: 2007-05-08
Classification: B41M,B42D,G07D,G07F

Abstract:
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 wherein the 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.