Embedded optical signatures in documents
First Claim
Patent Images
1. A method of embedding an optical signature on a substrate, comprising the steps of:
- embedding a first optical pattern on the substrate; and
placing an invisible covering over at least a portion of the first optical pattern, the invisible covering fluorescing when exposed to one or more non-visible wavelengths of light.
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Accused Products
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.
110 Citations
20 Claims
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1. A method of embedding an optical signature on a substrate, comprising the steps of:
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embedding a first optical pattern on the substrate; and
placing an invisible covering over at least a portion of the first optical pattern, the invisible covering fluorescing when exposed to one or more non-visible wavelengths of light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of embedding an optical signature on a substrate, comprising the steps of:
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embedding a first invisible optical pattern on the substrate, the invisible first optical pattern reflecting light in one or more non-visible wavelengths or fluorescing when exposed to one or more non-visible wavelengths of light; and
embedding a second visible optical pattern over at least a portion of the first invisible optical pattern. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of validating a document having an optical signature comprised of a disuniform edge of a substrate, comprising the steps of:
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placing the edge of the document against a background; and
determining if the edge is disuniform thereby indicating if the document is valid. - View Dependent Claims (18, 19, 20)
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Specification