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. 31, 2021
Filed:
Apr. 07, 2017
Hitachi, Ltd., Tokyo, JP;
Yasuhiko Tada, Tokyo, JP;
Tomotoshi Ishida, Tokyo, JP;
Hiroshi Sasaki, Tokyo, JP;
Kohhei Aida, Tokyo, JP;
Masahiro Kawasaki, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
To address the problem of providing a temperature history indicator capable of specifying a time when a temperature deviated from a set temperature range, a temperature history indicator according to the present invention is characterized in being provided with a substrate and temperature indicators that irreversibly change color upon deviation from a set temperature range, and in that a plurality of the temperature indicators are provided on the substrate, the temperatures at which the temperature indicators change color a within ±2° C. of each other, and the temperature indicators change color after different amounts of time from deviation from the set temperature range.