Method of marking a document or item; method and device for identifying the marked document or item; use of circular polarizing particles
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United States of America Patent
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May 29, 2012
Grant Date -
Aug 12, 2010
app pub date -
Apr 18, 2008
filing date -
Apr 24, 2007
priority date (Note) -
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Abstract
Optical identification and/or authentication of a document or item with the help of a marking comprising a random distribution of circular polarized light reflecting particles, the marking being applied to the document or item through an ink, and the reading device exploiting circular polarization to discriminate the flakes from the background.
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