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Non-counterfeitable document system

  • US 4,546,352 A
  • Filed: 06/22/1984
  • Issued: 10/08/1985
  • Est. Priority Date: 06/23/1980
  • Status: Expired due to Term
First Claim
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1. An authenticator device for verifying authenticity comprising:

  • a sheet of medium having a varying random characteristic over an area of said sheet, said characteristic being inherent in the composition of said medium; and

    machine-readable indicia on said sheet of medium, decodable to explicitly indicate at least one specific area location on said sheet at which the characteristic is to be measured.

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