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System and method for secure document printing and detection

  • US 8,415,164 B2
  • Filed: 12/11/2007
  • Issued: 04/09/2013
  • Est. Priority Date: 04/16/2003
  • Status: Expired due to Fees
First Claim
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1. A method for authenticating an ink in an ink cartridge comprising the steps of:

  • providing an optical reporter marker, the optical reporter marker having at least one light emitting upconverting phosphor particle linked by a linking group comprising an alkylene moiety, to a plurality of artificial polymorphic double stranded (ds)DNA fragments, said polymorphic dsDNA fragments each having an artificial sequence obtained by restriction digestion and ligation of extracted DNA and having an identifiable portion,introducing the optical reporter marker to the ink,detecting the optical reporter marker associated with the ink with a light source,obtaining a sample of the optical reporter marker from the ink for analysis;

    analyzing the sample to detect the presence of the identifiable portion of the nucleic acid linked to the upconverting phosphor particle and thereby authenticating the ink as genuine.

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