Anti-photographic/photocopy imaging process and product made by same
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United States of America Patent
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Apr 7, 1998
Issued Date -
N/A
app pub date -
Jan 3, 1997
filing date -
Oct 1, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Several techniques to acquire a counterfeit proof security document. The invention includes improvements for use with non-replicable image line frequency techniques, as well as stand-along printing techniques, that exhibit electro-optical copy and photographic copy frustration characteristics such as experiences with use of color-graduated (tonally graded) substrates, blooming or flaring print patterns, pixel differentiation of discrete indicia and combinations of these with certain printing ink (or) varnish under/overcoat.
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