Optical Multilayer
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United States of America Patent
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Issued Date -
Feb 5, 2015
app pub date -
Feb 7, 2013
filing date -
Feb 24, 2012
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Abstract
An optical multilayer (1) comprising textured surfaces suitable for use in anti-counterfeiting and/or security applications is described. The optical multilayer (1) comprises at least two textured layers, said layers having different refractive indices, wherein each of the
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