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US 6,712,894 B2Granted
Method of producing secure images using inks comprising modified pigment particles
AssigneeCabot Corporation
InventorPeter H. Shepard
Life of this patent
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Abstract
The present invention describes a method of producing an image which is visually distinct from its reproductions. This method comprises the steps of formulating an ink composition comprising a liquid vehicle and at least one modified pigment having attached at least one organic group and applying this ink composition to a substrate. Methods of determining the authenticity of an image and of verifying the date of creation of an image is also described.
Claims11
A method of producing an image which comprises the steps of:
- a) formulating an ink composition comprising a liquid vehicle and at least one modified pigment comprising a pigment having attached at least one organic group, b) applying the ink composition to a substrate, and c) producing an image, wherein the image is visually different from reproductions produced therefrom.
Dependencies are inferred from the claim text.