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. 24, 2001
Filed:
Apr. 28, 1999
Applicant:
Inventors:
Yichun Wang, Canton, MA (US);
Russell E. Hopson, Fairfax, VA (US);
Assignee:
Other;
Primary Examiner:
Int. Cl.
CPC ...
B05D 3/10 ;
U.S. Cl.
CPC ...
B05D 3/10 ;
Abstract
A method of changing the color of an ink mark includes applying an ink including a solvent and a triarylmethane dye dissolved in the solvent that changes color if contacted with a chemical agent to a substrate. The dye is soluble in phenyl cellosolve. A chemical agent is then applied to cause the dye to change color.