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:
Sep. 09, 2025
Filed:
Mar. 15, 2022
Applicant:
Tdk Corporation, Tokyo, JP;
Inventors:
Ikuya Kokawa, Tokyo, JP;
Yoshinori Fujikawa, Tokyo, JP;
Kenichi Suzuki, Tokyo, JP;
Yasushi Enokido, Tokyo, JP;
Assignee:
TDK CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F 1/055 (2006.01); B22F 9/04 (2006.01); H01F 7/02 (2006.01); H01F 41/02 (2006.01);
U.S. Cl.
CPC ...
H01F 1/0557 (2013.01); H01F 7/02 (2013.01); H01F 41/0293 (2013.01);
Abstract
The rare-earth-based magnet powder has an average value of 0.65 or more as sphericity P1 defined by an equation (1) of P1=Ls/Ll. In the equation (1), Ll is a length or a long side of a rectangle that circumscribes the rare-earth-based magnet powder in a photomicrograph so that an area of the rectangle is minimized, and Ls is a length of a short side of the rectangle that circumscribes the rare-earth-based magnet powder in the photomicrograph so that the area of the rectangle is minimized.