SECURITY DOCUMENT WITH EMBOSSED MULTI-LEVEL DOE
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United States of America Patent
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app pub date -
Jan 31, 2013
filing date -
Sep 15, 2006
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Abstract
A security document comprising a substrate including at least one region of transparent or translucent plastics material forming a window or half-window area, and a security device integrated into the window or half-window area, wherein the security device is formed from an embossed radiation curable ink, the security device including a diffractive structure comprising a multi-level diffractive optical element (DOE).
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