Methods for forming security articles having diffractive surfaces and color shifting backgrounds
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United States of America Patent
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Jul 13, 2010
Grant Date -
May 20, 2004
app pub date -
Nov 12, 2003
filing date -
Jul 8, 1999
priority date (Note) -
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Abstract
A security article includes a light transmissive substrate having a first surface and an opposing second surface, with the first surface having an embossed region with an optical diffraction pattern or a holographic image pattern. A color shifting optical coating is formed on the substrate such as on the opposing second surface, with the optical coating providing an observable color shift as the angle of incident light or viewing angle changes. The security article can be used in a variety of applications and products to provide for enhanced security measures such as anticounterfeiting.
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