Unfalsifiable safety paper
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United States of America Patent
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Feb 16, 1988
Grant Date -
N/A
app pub date -
Jan 17, 1986
filing date -
Jan 21, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
This invention relates to an unfalsifiable safety paper comprising on its surface and/or in its mass, at least one compound responding to formula: ##STR1## in which: R corresponds to hydrogen, to an alkyl group of C.sub.1 to C.sub.8, substituted or not, to a non-substituted, N-substituted or N,N-substituted amine group, to NO.sub.2, to a halogen; n is equal to 0 or 1. The invention is applicable to handwritten pieces for payment.
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