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. 05, 2026
Filed:
Mar. 15, 2023
Jfe Steel Corporation, Tokyo, JP;
Tomohiro Aoyama, Tokyo, JP;
Shun Koibuchi, Tokyo, JP;
Shinichi Furuya, Tokyo, JP;
Takeshi Matsuda, Tokyo, JP;
Takashi Kawano, Tokyo, JP;
JFE Steel Corporation, Tokyo, JP;
Abstract
A steel sheet includes a base steel sheet and a film disposed on at least one side of the base steel sheet. In the steel sheet, the film includes an organic resin and a wax, the arithmetic average roughness Ra of the base steel sheet is 0.4 μm or more, the organic resin is at least one resin selected from acrylic resins, epoxy resins, urethane resins, phenolic resins, vinyl acetate resins, and polyester resins, the wax is a polyolefin wax with a melting point of 120° C. or above and 140° C. or below and an average particle size of 3.0 μm or less, the fraction of the wax in the film is 10 mass % or more, and the standard deviation σ of the film coating weight distribution per side is less than 0.9 g/m.