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. 29, 2014
Filed:
Dec. 31, 2011
Applicant:
Wing Sum Vincent Kwan, Chicago, IL (US);
Inventor:
Wing Sum Vincent Kwan, Chicago, IL (US);
Assignee:
Sanford, L.P., Oak Brook, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B41M 5/30 (2006.01);
U.S. Cl.
CPC ...
Abstract
Disclosed herein are irreversible thermochromic ink compositions including a volatile color activator and a color change dye capable of becoming substantially colorless upon evaporation of the volatile color activator. The volatile color activator and the color change dye can be, optionally, encapsulated. Written marks made with the thermochromic ink compositions can be subjected to a force directing component, which can include generating heat and/or friction, to evaporate the volatile color activator, thereby causing the color change dye to become substantially colorless.