The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 21, 2009
Filed:
Jun. 29, 2004
Jie LI, Allentown, PA (US);
Cheryl Krieger, Bangor, PA (US);
Arthur N. Urbanski, Bangor, PA (US);
Craig Skinner, Easton, PA (US);
Karl Guyler, Bucyrus, KS (US);
Stephen D. Glasscock, Overland Park, KS (US);
Jie Li, Allentown, PA (US);
Cheryl Krieger, Bangor, PA (US);
Arthur N. Urbanski, Bangor, PA (US);
Craig Skinner, Easton, PA (US);
Karl Guyler, Bucyrus, KS (US);
Stephen D. Glasscock, Overland Park, KS (US);
Crayola LLC, Easton, PA (US);
Abstract
The present invention is a system for hiding and later revealing a hidden layer. The system includes a substrate and applicator. As the user moves the applicator around the substrate, a coating is rendered transparent to reveal a hidden layer under the pattern of the user's movement of the applicator. The system comprises a substrate at least partially coated with a generally opaque coating that reacts with an eradicator fluid. A preferred coating as applied to the substrate comprises 20-80 wt % water, 0-3 wt % defoamer, 0-3 wt % surfactant, 0-5 wt % wetting agent, 1-25 wt % colorant, 1-60 wt % resin, and 0-4 wt % preservatives. A preferred reducing fluid in such case comprises 30-95 wt % water, 1-5 wt % pH adjuster, 5-15 wt % reducing agent, 0-5 wt % surfactant, and 2-10 wt % buffer.