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:
May. 10, 1988
Filed:
Apr. 22, 1986
Applicant:
Inventors:
Andrew V Brown, San Jose, CA (US);
Wendell W Moyer, Atherton, CA (US);
Assignee:
Raychem Corporation, Menlo Park, CA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C09K / ; C09D / ;
U.S. Cl.
CPC ...
2524081 ; 252962 ; 116207 ; 116216 ; 116219 ; 374161 ;
Abstract
A temperature indicating composition is provided for use on recoverable articles so that heating to produce recovery or to activate a heat-activatable sealant can be monitored. The composition comprises a thermochromic colorant in a binder and an activator that causes the thermochromic colorant to change color at a temperature lower than the temperature at which the colorant would change temperature in the absence of the activator. The thermochromic colorant can be folic acid and the activator can be an acid that has a pK of less than 4.2.