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Unalterable self-verifying articles

  • US 5,984,366 A
  • Filed: 11/22/1996
  • Issued: 11/16/1999
  • Est. Priority Date: 07/26/1994
  • Status: Expired due to Term
First Claim
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1. A self-verifying article comprising:

  • a surface;

    a first data set fixed upon said surface; and

    a second data set fixed upon said surface, said second data set being all encoded copy of at least a portion of said first data set and being configured as an optically readable code forming at least one matrix array having a perimeter and alternating black and white symbols alone said perimeter.

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