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:
Mar. 16, 2004
Filed:
Jan. 10, 2001
Applicant:
Inventors:
Brett L. Lucht, Wakefield, RI (US);
William B. Euler, Narragansett, RI (US);
Otto J. Gregory, Wakefield, RI (US);
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N 3/122 ; G01K 1/116 ;
U.S. Cl.
CPC ...
G01N 3/122 ; G01K 1/116 ;
Abstract
A thermochromic polymer-based temperature indicator composition which comprises a polythiophene and a carrier medium. The composition is characterized in that the polythiophene is present in the medium in an amount of about 0.05 to about 5.0% by weight based on the total weight of the composition. The structure of the compound is designed such that when the composition is placed in a heat-exchange relationship with an article, the composition will exhibit a color change when a design temperature or a temperature beyond the design temperature is reached in the article.