Security document with micro-prisms
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United States of America Patent
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Apr 2, 2013
Grant Date -
Mar 11, 2010
app pub date -
Oct 10, 2007
filing date -
Oct 12, 2006
priority date (Note) -
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Abstract
A security document including a substrate of transparent polymeric material, and opacifying layers provided on opposing sides of the substrate, the opacifying layers acting to guide light propagating within the substrate, wherein the substrate is formed with at least one micro-prism for diverting light propagating within or entering the substrate.
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