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Counterfeit-resistant materials and a method and apparatus for authenticating materials

United States Patent

6,035,914
March 14, 2000
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
Fluorescent dichroic fibers randomly incorporated within a media provide an improved method for authentication and counterfeiting protection. The dichroism is provided by an alignment of fluorescent molecules along the length of the fibers. The fluorescent fibers provide an authentication mechanism of varying levels of capability. The authentication signature depends on four parameters; the x,y position, the dichroism and the local environment. The availability of so many non-deterministic variables makes production of counterfeit articles (e.g., currency, credit cards, etc.) essentially impossible. Counterfeit-resistant articles, an apparatus for authenticating articles, and a process for forming counterfeit-resistant media are also provided.
Ramsey; J. Michael (Knoxville, TN), Klatt; Leon N. (Oak Ridge, TN)
Martin Marietta Energy Systems Inc. (Oak Ridge, TN)
08/ 141,387
October 22, 1993
The United States Government has rights in this invention pursuant to Contract No. DE-AC05-840R21400 between the U.S. Department of Energy and Martin Marietta Energy Systems, Inc.