Printed security with hallmarks
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United States of America Patent
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-
May 27, 1986
Issued Date -
N/A
app pub date -
Aug 23, 1984
filing date -
Oct 18, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
This invention relates to a security paper with a hallmark in the form of a coating applied by vacuum deposition techniques to the surface of a paper substrate. The coating is very thin and almost invisible to the naked eye even as a metal layer, although permitting accurate automatic or machine examination for verification purposes. the absorption of the hallmarks in a certain range of the wavelength of the spectrum, the exiting spcetrum of luminescence, the photoconductivity and/or the electrical conductivity of the hallmarks are characteristics used during the automatic examination of the authenticity of the security paper.
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