Document protection methods and products
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Aug 4, 1998
Grant Date -
N/A
app pub date -
Jun 19, 1996
filing date -
Jun 13, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
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/negative images of continuous lines to produce broken lines of a desired width and pitch.
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Cited Art Landscape
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