Optically variable devices, their production and use
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United States of America Patent
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Apr 26, 2016
Grant Date -
May 9, 2013
app pub date -
Apr 21, 2011
filing date -
Apr 21, 2010
priority date (Note) -
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Abstract
Security documents often incorporate optically variable devices to prevent or hinder counterfeiters. Disclosed herein are layered optically variable devices such as colour-shift foils that employ a piezoelectric layer, and methods for their production and use. Such devices afford new techniques for a user of a security document to check quickly and easily whether the security document is a legitimate document or a counterfeit copy by placing an electrical potential difference across the security document.
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