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Method and apparatus for patterning cards, instruments and documents

  • US 20010010333A1
  • Filed: 12/22/2000
  • Published: 08/02/2001
  • Est. Priority Date: 11/12/1998
  • Status: Active Grant
First Claim
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1. A card comprising:

  • generally parallel top and bottom surfaces defining a space therebetween and four sides around the edge of the card; and

    a multiplicity of light pipes randomly placed between the top and bottom surfaces of said card, said light pipes being randomly placed to produce a random pattern within the space, whereby the pattern formed within any particular card is different from any other card.

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