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Machine-readable security features for printed objects

  • US 7,537,170 B2
  • Filed: 11/15/2004
  • Issued: 05/26/2009
  • Est. Priority Date: 08/31/2001
  • Status: Expired due to Term
First Claim
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1. A printed document including a machine-readable signal comprising:

  • a first set of print structures conveyed with first ink; and

    a second set of print structures convey with optical variable ink, the second set of print structures comprises breaks in lines, with the second set of print structures conveying a machine-readable plural-bit auxiliary signal,wherein the second set of print structure are provided to cooperate with the first set of print structures so that at a first observation angle the first set of print structures and the second set of print structures appear to provide a first visibly perceptible feature; and

    wherein at a second observation angle the second set of print structures appear less observable so that the first set of print structures and the second set of print structures provide a second visibly perceptible feature.

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