Optically-based methods and apparatus for performing document authentication
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United States of America Patent
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May 11, 1999
Issued Date -
N/A
app pub date -
Apr 10, 1997
filing date -
Mar 18, 1994
priority date (Note) -
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Abstract
This invention teaches a method for authenticating a document. The method includes the steps of: (a) providing a document to be authenticated; (b) illuminating at least a portion of the document with laser light that exceeds a threshold fluence; (c) detecting a narrow band laser-like emission of at least one wavelength from the document in response to the step of illuminating; and (d) declaring the document to be authentic only if the laser-like emission is detected.
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