Steganographically encoded media object having an invisible...

Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond

Reexamination Certificate

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C283S902000, C428S916000

Reexamination Certificate

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06936334

ABSTRACT:
A medium for displaying information thereon, the medium includes a substrate; and visible information formed from a plurality of colors displayed on the substrate; wherein at least one of the colors includes at least one visible colorant and at least one invisible colorant which invisible colorant is imperceptible to the human eye and which is not present in a reproduction therefrom for detecting counterfeiting or forgery.

REFERENCES:
patent: 3886083 (1975-05-01), Laxer
patent: 4866025 (1989-09-01), Byers et al.
patent: 4866027 (1989-09-01), Henzel
patent: 4942141 (1990-07-01), DeBoer et al.
patent: 4950640 (1990-08-01), Evans et al.
patent: 5586787 (1996-12-01), Brown et al.

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