Document containing security images

Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond

Reexamination Certificate

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Details

C428S029000, C283S072000, C430S010000

Reexamination Certificate

active

07906198

ABSTRACT:
A document containing security images which enable original documents to be distinguished from copies of the originals. The document60bears an image63containing a latent image68. Latent image68may be formed from two or more images65and66. The first image65is preferably formed at a high line frequency and at a first angle in one or more colors. The second image66is preferably formed at a lower line frequency at the same angle as first image65and in one or more colors. The colors in the first image65and the second image66are preferably chosen so that latent image68has substantially the same color as image63.

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Phillips, “Combining nanocharacter printing, digital watermarking and UB coded taggents for optimal machine readable security” Optical Security and Counterfeit Deterrence Techniques, vol. 4677, Jan. 24, 2002 pp. 150-158, XP002296367.
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