Chemically encoded security papers
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United States of America Patent
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-
Jul 4, 2000
Grant Date -
N/A
app pub date -
Feb 2, 1998
filing date -
Feb 2, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A counterfeit-resistant document comprises a validation mark with a unique chemical signature that identifies the source of the document. The source of the document can be identified by detecting the unique chemical signature on the validation mark of the document, thus verifying the authenticity of the document. The unique chemical signature is applied to the document as ink, so that the validation mark provides information. The validation mark is latent in that the color of the coating matches that of the document, but the directional reflective properties of ink is more uniform than that of the document. In this manner, the letters cannot be readily ascertained by viewing them at an angle perpendicular to the surface of the document, but can be readily ascertained by viewing them at an angle different from that perpendicular to the surface of the document.
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