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:
Apr. 21, 2026
Filed:
May. 14, 2020
Kyushu Institute of Technology, Kitakyushu, JP;
Tokin Corporation, Shiroishi, JP;
Masaaki Takezawa, Kitakyushu, JP;
Hiroaki Machida, Sendai, JP;
Teruhiko Fujiwara, Sendai, JP;
Yu Kanamori, Sendai, JP;
KYUSHU INSTITUTE OF TECHNOLOGY, Kitakyushu, JP;
TOKIN CORPORATION, Shiroishi, JP;
Abstract
A rare-earth cobalt permanent magnet according to the present disclosure comprises: 24 to 26 mass % of a rare-earth element R including Sm; 25 to 27 mass % of Fe; 4.0 to 7.0 mass % of Cu; 2.0 to 3.5 mass % of Zr; and Co and an unavoidable impurity as a remainder. The rare-earth element R is any one of a combination of Sm and Nd, a combination of Sm and Pr, or a combination of Sm, Nd, and Pr. The rare-earth cobalt permanent magnet includes a cell phase that includes a crystalline phase of a ThZnstructure and a cell wall that includes a crystalline phase of an RCostructure enclosing the cell phase, and the concentration of the rare-earth element R in the cell wall is higher than the concentration of the rare-earth element R in the cell phase by no less than 25 atomic %.