Security elements and method for their manufacture
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United States of America Patent
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Jun 13, 2017
Grant Date -
Aug 27, 2015
app pub date -
Sep 13, 2013
filing date -
Sep 17, 2012
priority date (Note) -
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Abstract
The present invention relates to complex security elements based on recording materials for optical elements with refractive index modulation, in particular, holograms, which are subsequently coated with specific metallic nano-shaped metal particles, a method for their manufacture, in particular on a paper or on a plastic substrate and a security product obtainable using the security element. A further aspect of the invention is the use of such a security element for the prevention of counterfeit or reproduction of a document of value.
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