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:
Feb. 26, 1980
Filed:
Apr. 13, 1978
Applicant:
Inventors:
Assignee:
Akzona Incorporated, Asheville, NC (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G01K / ; G01K / ; B32B / ;
U.S. Cl.
CPC ...
73356 ; 73358 ; 116216 ; 116219 ; 428164 ; 428165 ; 428336 ; 428339 ; 428462 ; 428521 ; 428913 ;
Abstract
There is provided a temperature indicating device such as a thermometer having a thermally conductive foil as a carrier layer, the carrier layer having one or more cavities formed by depression in the foil material. The depressions are filled with solid mixtures which melt at predetermined temperatures and are composed of ortho-chloronitrobenzene, ortho-bromonitrobenzene, and a dyestuff. A transparent cover layer seals the cavities and their contents. The transparent cover layer and carrier layer are bonded to each other by means of a pressure-sensitive adhesive which includes polyisobutylene.