Security paper and method of manufacturing the same
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United States of America Patent
Stats
-
Nov 10, 1992
Issued Date -
N/A
app pub date -
Mar 9, 1992
filing date -
Apr 12, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A security paper includes at least two layers of paper each having inner and outer surfaces and predetermined mechanical properties, color and optical density. Authentication indicia is printed on the inner surface of at least one layer. The indicia is formed of a chemically, mechanically and thermally stable medium having a predetermined color, color intensity and optical density. A chemically, mechanically and thermally stable adhesive permanently adheres the inner surfaces of the layers together. The adhesive has a predetermined color and optical density. The color and optical density of the layers, the color, color intensity and optical density of the medium and the color and optical density of the adhesive combine to render the authentication indicia detectable in transmitted light and substantially imperceptible in reflected light.
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