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

PATENT NO 8746555
APP PUB NO 20130235322A1
SERIAL NO

13869641

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Abstract

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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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Patent Owner(s)

  • SICPA HOLDING SA

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Callegari, Andrea Chavannes-pres-Renens, CH 31 190
Decoux, Eric Vevey, CH 36 239

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