Security documents and a method and apparatus for printing...

Printed matter – Having revealable concealed information – fraud preventer or... – Having watermark

Reexamination Certificate

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C283S072000, C283S093000

Reexamination Certificate

active

10205812

ABSTRACT:
A security document and a method of making and authenticating the document in which the document contains a security feature of an image/background pattern printed in one subtractive color on the document and at least one other but different image/background pattern printed in another subtractive color superimposed directly over the one image/background pattern.

REFERENCES:
patent: 1002600 (1911-09-01), Morris et al.
patent: 4033059 (1977-07-01), Hutton et al.
patent: 4588212 (1986-05-01), Castagnoli
patent: 4715623 (1987-12-01), Roule et al.
patent: 5487567 (1996-01-01), Volpe
patent: 5722693 (1998-03-01), Wicker
patent: 5974150 (1999-10-01), Kaish et al.
patent: 6222650 (2001-04-01), Long
patent: 6296281 (2001-10-01), Stone
patent: 2003/0015866 (2003-01-01), Cioffi et al.

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