Method of rendering a document or portion of it resistant to photocopying
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 11, 1992
Grant Date -
N/A
app pub date -
Nov 8, 1988
filing date -
Nov 20, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An article with at least a portion carrying symbols representing information to be protected against photocopying is formed by a carrier, a continuous layer covering the portion of the carrier and forming a background thereon, and a mainly discontinuous layer applied on the continuous layer and forming the symbols against the background. One of the layers is an iridescent layer of a color that copies dark and the other of the layers has a dark color. Thus photocopying gives an image without distinction between the symbols and the background.
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Cited Art Landscape
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