Security structure including nematic liquid crystals
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United States of America Patent
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Mar 19, 2013
Grant Date -
Nov 4, 2010
app pub date -
Dec 17, 2008
filing date -
Dec 24, 2007
priority date (Note) -
Expired
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Abstract
A security structure including: a first region that is at least partially reflective and of low opacity; a second region that is at least partially reflective and of higher opacity than the first region; and a layer of a coating presenting birefringence properties, covering the first and second regions, at least in part.
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