Method for the marking of documents
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Jun 11, 1996
Grant Date -
N/A
app pub date -
Jan 28, 1994
filing date -
May 29, 1992
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A mark is incorporated to the original during the fabrication of said original in such a way that said mark is invisible on the original but appears on the copy of the original which is made by using a photocopying machinge. The mark is incorporated by additionally mixing the original image to be protected and the marking image to be concealed in the original by modulating one or the other of the images or by manipulation of Fourier transforms.
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Cited Art Landscape
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