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:
Dec. 01, 2020
Filed:
Jun. 23, 2015
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Akira Tachiki, Kitakyushu, JP;
Shigeru Hirano, Kitakyushu, JP;
Yoshiaki Tani, Kitakyushu, JP;
Hirokazu Yokoya, Onga-gun, JP;
Morio Yanagihara, Wuhan, CN;
NIPPON STEEL CORPORATION, Tokyo, JP;
Abstract
A steel sheet for containers including a steel sheet, a Sn coated layer that is formed on at least one surface of the steel sheet, and a chemical treatment layer that is formed on the Sn coated layer. A variation amount in a yellowness index measured at one measurement point on the outermost surface of the chemical treatment layer is defined as ΔYI, and represented by ΔYI=YI−YI, wherein YI is the yellowness index measured after the steel sheet for containers is subjected to a retort treatment at a temperature of 130° C. for 5 hours, and YIis the yellowness index measured before the retort treatment. An average of absolute values of the ΔYI obtained at a plurality of measurement points included in a unit area of the outermost surface is 5.0 or less.