Patent · US Active

Method of marking a document or item; method and device for identifying the marked document or item; use of circular polarizing particles

US8186573B2 · kind B2 · utility

10Cited by

21References

21Claims

0Family size

Assignee

SICPA HOLDING SA · CH

Inventors

Andrea Callegari · Ecublens, CH
Eric Decoux · Vevey, CH

Key dates

Filing date	Apr 18, 2008
Grant date	May 29, 2012
Priority date	—
Expiry date	Apr 18, 2028

Classification

Technology area (CPC G)Physics
CPC primaryG07D7/12
WIPO fieldControl
WIPO sectorInstruments

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.