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Detection and deterrence of counterfeiting of documents with tokens characteristic color and spacing

  • US 6,343,204 B1
  • Filed: 08/25/1999
  • Issued: 01/29/2002
  • Est. Priority Date: 08/25/1999
  • Status: Expired due to Fees
First Claim
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1. An apparatus for deterring counterfeiting of documents, the apparatus comprising:

  • a first-level detector adapted to detect an initial token having a characteristic color and to thereby quickly eliminate from suspicion a majority of types of the documents without the initial token as legitimate while identifying a minority of types of the documents with the initial token as potentially counterfeit documents;

    a second-level detector adapted to further test the potentially counterfeit documents identified by the first-level detector to search for a second token spaced at one of a set of one or more predetermined distances from the initial token, such that detection of the second token can verify which of the potentially counterfeit documents are counterfeit copies; and

    an alarm adapted to signal detection of the counterfeit documents by the second-level detector.

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