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Apparatus and methods for fluorescent imaging and optical character reading

  • US 5,867,586 A
  • Filed: 05/27/1997
  • Issued: 02/02/1999
  • Est. Priority Date: 06/24/1994
  • Status: Expired due to Term
First Claim
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1. A process for marking articles for authentication, comprising the steps of:

  • a) providing one or more predetermined fluorescent substances,b) providing a transparent non-fluorescent carrier medium in which said fluorescent substances are miscible,c) mixing said fluorescent substances in predetermined concentrations in said carrier medium,d) selecting indicia from a predetermined set of characters and graphic images readable by optical character recognition means and image comparison means respectively, ande) printing said selected indicia on said articles with said carrier medium containing said predetermined concentrations of said fluorescent substances, said selected indicia being printed in predetermined offset from registration with indicia previously printed on said article, and said predetermined offset being chosen such that said selected indicia and said previously printed indicia in combination form a stereogram when viewed from a standard near-point reading distance of 25 centimeters.

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