Optics: measuring and testing – Document pattern analysis or verification
Reexamination Certificate
2008-07-22
2008-07-22
Stafira, Michael P (Department: 2886)
Optics: measuring and testing
Document pattern analysis or verification
Reexamination Certificate
active
07403272
ABSTRACT:
A method and device for the identification of documents and banknotes marked with Optical Variable Inks providing: generating a white light ray between 5,000° and 7,000° K; polarizing that white light ray through a first polarizing filter (3), and sending the polarized ray (4) onto an area (5) to be assessed; filtering the ray (6) reflected the area (5) to be assessed by a second polarizing filter (7), in phase consistency with the first polarizing filter (3) and getting a first signal (sa); filtering the ray (6) reflected by the area (5) to be assessed by a third polarizing filter (8), in anti-phase with the first polarizing filter (3), and getting a second signal (sb); measuring the difference Δ between these two signals; comparing the calculated value Δ to a reference value Δrpreviously measured on genuine documents and banknotes.
REFERENCES:
patent: 7119900 (2006-10-01), Okumura et al.
patent: 1151271 (1967-02-01), None
patent: WO 03/084767 (2003-10-01), None
patent: WO 2004/013817 (2004-02-01), None
Coombs et al., Improved Verification Methods for OVI™ Security Ink. (2000) Optical Security and Counterfeit Deterrence Techniques III, vol. 3973, pp. 296-303.
NUMEROUNO Ricerche S.r.l.
Stafira Michael P
Young & Thompson
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