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Flash imaging and voidable articles

DC
  • US 5,109,153 A
  • Filed: 04/17/1990
  • Issued: 04/28/1992
  • Est. Priority Date: 04/17/1990
  • Status: Expired due to Term
First Claim
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1. A voidable article comprising:

  • a printed surface;

    a machine readable identification code on an area of said printed surface;

    a material, peculiarly responsive to a particular form of radiant energy not normally present in ambient light in amounts sufficient to cause said material to discolor, positioned on said printed surface in the area of said machine readable code, said material making said code unreadable after being exposed to said particular form of radiant energy.

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