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SECURITY FEATURE COMPRISING A PERFORATION PATTERN

  • US 20020027359A1
  • Filed: 07/20/1999
  • Published: 03/07/2002
  • Est. Priority Date: 11/05/1996
  • Status: Active Grant
First Claim
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1. Document to be protected against forgery, comprising a security feature in the form of a perforation pattern, characterized in that the perforation pattern extends over a closed surface of the document and represents a depiction comprising brightness tones from a continuous scale, and that the perforation pattern is applied by means of laser light.

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