Forgery-proof safety paper
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United States of America Patent
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Nov 23, 1993
Grant Date -
N/A
app pub date -
May 24, 1990
filing date -
Jun 1, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
This invention relates to the paper-making domain and especially to a forgery-proof safety paper, which includes on its surface and/or in its mass, at least one compound responding to formula: ##STR1## in which: R.sub.1, R.sub.2, R.sub.3 may be either H, OH, or OR, R being a hydrocarbon chain, substituted or not, straight, cyclic or aromatic, with A forming one or more cycles, substituted or not. This invention is particularly applicable to forgery-proof safety papers such as cheques or handwritten documents for payment.
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