Sheet with a copy-resistant region of reduced opacity

Details Sheet with a copy-resistant region of reduced opacity Sheet with a copy-resistant region of reduced opacity

2011-06-28

2011-06-28

Hess, Bruce H. (Department: 1785)

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

91, C283S072000, C283S057000, C283S077000, C283S091000, C283S092000, C283S093000, C283S094000, C283S058000, C430S010000, C430S301000, C430S302000, C430S303000, C430S304000, C430S305000, C430S306000, C430S307000, C430S308000, C358S405000, C358S302000, C358S451000, C358S533000, C356S604000, C356S608000, C356S636000

Reexamination Certificate

active

07968173

ABSTRACT:
The present invention relates to printable security paper that includes a region capable of receiving printed indicia on the front side and on the reverse side which are observable in reflected light and form an image observable in transmitted light, as security element protecting against two-sided copying, characterized in that such region is a screened region having an average overall opacity less than the opacity of the vellum part of the rest of the paper, said screened region being made up from alternations of vellum miniregions, having an approximately constant thickness equal to that of the vellum part of the rest of the paper, and of miniregions of reduced opacity because of their smaller thickness compared with the vellum miniregions. The invention also relates to the security document obtained with this paper.

REFERENCES:
patent: 4766026 (1988-08-01), Lass et al.
patent: 6494491 (2002-12-01), Zeiter et al.
patent: 6991260 (2006-01-01), Fan et al.
patent: 6991846 (2006-01-01), Mallol et al.
patent: 6997482 (2006-02-01), Mathys
patent: 7429062 (2008-09-01), Fan et al.
patent: 2005/0244720 (2005-11-01), Doublet
patent: 1 122 360 (2001-08-01), None
patent: 1122360 (2001-08-01), None
patent: WO 00/43216 (2000-07-01), None
Patent Abstracts of Japan, Publication No. 2000290896, published on Oct. 17, 2000.

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