Optical: systems and elements – Diffraction – From grating
Reexamination Certificate
2007-09-04
2007-09-04
Assaf, Fayez G. (Department: 2872)
Optical: systems and elements
Diffraction
From grating
C359S568000, C359S002000
Reexamination Certificate
active
10562331
ABSTRACT:
The invention concerns an optical security element having a substrate layer, in which a first microstructure for producing a first optically perceptible effect is shaped region-wise in a surface region. The surface region is divided into microscopically fine pattern regions and a background region. The first microstructure is shaped in the pattern regions but not in the background region. The microscopically fine pattern regions in the surface region are arranged in the form of a moire pattern into which a concealed item of information which can be evaluated by means of an associated verification element is encoded as a security feature. The microscopically fine pattern regions are further substructured in accordance with a substructuring function which describes a microscopic substructuring, serving as a further security feature, of the moire pattern.
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Schilling Andreas
Staub Rene
Tompkin Wayne Robert
Assaf Fayez G.
Hoffmann & Baron , LLP
OVD Kinegram AG
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