×

Document made fraud-proof by an irreversibly distortable weakening pattern

  • US 6,302,444 B1
  • Filed: 10/22/1999
  • Issued: 10/16/2001
  • Est. Priority Date: 02/19/1997
  • Status: Expired due to Term
First Claim
Patent Images

1. A fraud-proof document comprising a carrier and at least one detachable marking arranged on said carrier, wherein a part of the surface of the carrier to which the marking is applied is weakened with a pattern comprising a groove or a series of perforations, wherein the weakened pattern is arranged in the carrier only whereby when said markings are detached from said carrier the result is a permanent and easily visible distortion of the pattern.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×