Security element

Details Security element Security element

2011-04-19

2011-04-19

Punnoose, Roy (Department: 2886)

Optics: measuring and testing

Document pattern analysis or verification

Reexamination Certificate

active

07929124

ABSTRACT:
The invention relates to an object of value with a security element, which has at least one liquid-crystalline material, the liquid-crystalline material effecting a linear polarization of light.

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patent: 2005/0024626 (2005-02-01), Faris
Moia, F.,New coloured optical security elements during Rolic's LPP/LCP technology: devices for 1stto 3rdlevel inspection, Optical Security and Counterfeit Deterrence Techniques IV, Proceedings of SPIE vol. 4677, (2002), 194-202.

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