Information bearing article with tamper resistant scratch-off opaque coating
AssigneeScientific Games of California, Inc.
InventorBradley W. Walton
Life of this patent
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Abstract
An indicia bearing article, such as a lottery ticket, contest form or other document, for example, is provided. The article includes an indicia bearing sheet and an opaque coating thereover for hiding the indicia. The opaque coating contains metal particles and at least one undissolved dye soluble in at least one solvent and dispersed in the opaque coating and hidden beneath the metal particles, for providing visual evidence of exposure to the solvent.
Claims30
An opaque abrasive removable coating applied to an article of the type including an indicia bearing surface, for providing a visual indication of exposure to at least one solvent, said opaque coating comprising a binder having metal particles and at least one undissolved dye soluble in at least one solvent and dispersed in said binder and hidden beneath said metal particles, for providing visual evidence of exposure to said solvent.
An indicia bearing article of the type having hidden indicia not readily detectable except by irreversible alteration of said article, said article comprising:
- an indicia bearing surface;
- an opaque abrasive removable coating over at least a portion of said indicia for hiding said indicia, said opaque coating comprising a binder containing metal particles and at least one undissolved dye soluble in at least one solvent and dispersed in said binder and hidden beneath said metal particles, for providing visual evidence of exposure to said solvent.
Dependencies are inferred from the claim text.