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AssigneeTroy Group, Inc.
InventorsXiaorong Cai, Michael R. Riley
Estimating the term…
Method of making color changing inkjet inks for security printing applications use photochromic materials that cause the inkjet ink to print marks that are colorless under ambient light and appear in a color when exposed to sunlight or UV light (covert). In another embodiment, the printed mark appears in a first color under ambient light, and changes to a second color when exposed to sunlight or UV light (overt). The methods of making the photochromic inks produce ink components that are stable and maintain their color changing capability for the shelf life of the printed material. The inkjet ink formulations are suitable for use on porous and non-porous surfaces, such as plain paper, coated paper, Teslin, polymer film, ceramic or metal, for example.
A method of making a photochromic inkjet ink for printing invisible marks on a porous substrate with an inkjet printer, the printed marks changing to a visible color upon exposure to sunlight or UV light, the method comprising:
A method of making a photochromic inkjet ink for printing invisible marks on a non-porous substrate with an inkjet printer, the printed marks changing to a visible color upon exposure to sunlight or UV light, the method comprising:
A method of making a photochromic inkjet ink for printing visible marks having a first color on a substrate with an inkjet printer, the printed marks changing to a second color, different from the first color, upon exposure to sunlight or UV light, the method comprising:
A photochromic inkjet ink formulation that prints an invisible mark on a substrate and changes to a visible color mark upon exposure to sunlight or UV light, the formulation comprising:
A photochromic inkjet ink formulation that prints an invisible mark on a substrate and changes to a visible color mark upon exposure to sunlight or UV light, the formulation comprising:
A photochromic inkjet ink formulation that prints a visible mark of a first color on a substrate and changes to a second different color upon exposure to sunlight or UV light, the formulation comprising:
A photochromic inkjet ink formulation that prints an invisible mark on a substrate and changes to a visible mark upon exposure to sunlight or UV light, the formulation comprising:
Dependencies are inferred from the claim text.