Embedded optical signatures in documents
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United States of America Patent
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Nov 23, 2010
Issued Date -
N/A
app pub date -
Mar 29, 2006
filing date -
Dec 19, 2003
priority date (Note) -
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Abstract
A method of embedding an optical signature in a document and document produced therefrom. The optical signature uses an invisible optical pattern or covering that can reflect light in non-visible wavelengths, such as light in infrared, or fluoresces when exposed to a particular wavelength of light, such as ultra-violet light. The invisible optical pattern can be a covering over another optical pattern, or a base pattern upon which a second optical pattern is embedded.
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