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. 19, 2026
Filed:
Oct. 26, 2021
Nippon Steel Corporation, Tokyo, JP;
Masaru Takahashi, Tokyo, JP;
Takahito Mizumura, Tokyo, JP;
NIPPON STEEL CORPORATION, Tokyo, JP;
Abstract
In this method of producing a wound core, at least one bent portion () of one or more laminated grain oriented electrical steel sheets () is formed such that one side () of the steel sheet () is placed and constrained on a die () and a punch () is press formed against a portion () of the steel sheet () to be bent on the other free end side in the thickness (T) direction of the steel sheet. Outer surfaces of the die and the punch each have an arc portion () having a predetermined curvature, and when the thickness of the steel sheet () is T, bent angles of the bent portions () are θ(°), a radius of curvature of the arc portion () of the die is Rd, and a radius of curvature of the arc portion () of the punch is Rp, relationships of Equations (1) to (5) below are satisfied.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile