Document protection methods and products

Details Document protection methods and products Document protection methods and products

1996-06-19

1998-08-04

Fridie, Jr., Willmon

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing electromagnetic radiation

285 91, 285902, B42D 1500

Patent

active

057882851

ABSTRACT:
A method and product for making non-reproducible documents, in which a nearly invisible indicia on the document is printed by continuous screened lines of a desired pitch, and a background that will not reproduce by copying that is formed by orthogonal reproduction of positive
egative images of continuous lines to produce broken lines of a desired width and pitch.

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van Renesse, Rudolf L. ed., Optical Document Security, Chapters 7 and 15, 1994.

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