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:
Aug. 05, 2003
Filed:
Apr. 23, 2001
Abstract
An irreversible heat-sensitive composition comprises a mixture of a granular or powdery heat-fusible substance having a melting point corresponding to a temperature to be recorded and a granular or powdery dyestuff diffusible into the fused heat-fusible substance through dispersion or dissolution. A heat-sensitive ink comprises the irreversible heat-sensitive composition and an ink vehicle capable of diffusing the fused heat-fusible substance therein. A heat-sensitive ink according to another embodiment comprises microcapsules, which encapsulate the irreversible heat-sensitive composition. A heat-sensitive indicator comprises a substrate provided thereon with a printed heat-sensitive ink, the heat-sensitive ink being one of these heat-sensitive inks.