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. 11, 2020
Filed:
Apr. 07, 2016
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Nippon Steel & Sumikin Materials Co., Ltd., Tokyo, JP;
Masaharu Ibaragi, Tokyo, JP;
Koichi Nose, Tokyo, JP;
Yasuto Goto, Tokyo, JP;
Nobuo Kadowaki, Tokyo, JP;
Hiroto Unno, Tokyo, JP;
NIPPON STEEL CORPORATION, Tokyo, JP;
NIPPON STEEL CHEMICAL & MATERIAL CO., LTD., Tokyo, JP;
Abstract
A steel foil for an electrical storage device container, including a steel foil, a metal chromium layer layered on the steel foil, and a hydrated chromium oxide layer layered on the metal chromium layer, in which the concentration of Fe from a surface of the hydrated chromium oxide layer to a depth of 10 nm is less than 10% by mass, the area ratio of a site having an arithmetic mean roughness Ra of 10 nm or more in a visual field of 1 μm at the surface of the hydrated chromium oxide layer is less than 20%, and a site having an arithmetic mean roughness Ra of less than 10 nm in a visual field of 1 μm has an arithmetic mean roughness Ra of 3 nm or less in a visual field of 1 μm at the surface of the hydrated chromium oxide layer, is adopted.