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:
Jan. 07, 2020
Filed:
Mar. 10, 2015
Applicant:
Tdk Corporation, Tokyo, JP;
Inventors:
Shogo Kadota, Tokyo, JP;
Kenichi Suzuki, Tokyo, JP;
Yuji Umeda, Tokyo, JP;
Ryuji Hashimoto, Tokyo, JP;
Keiji Takeda, Tokyo, JP;
Assignee:
TDK CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F 1/055 (2006.01); B22F 3/16 (2006.01); H01F 1/058 (2006.01); H01F 1/059 (2006.01); H01F 1/057 (2006.01); C22C 38/00 (2006.01);
U.S. Cl.
CPC ...
H01F 1/057 (2013.01); B22F 3/16 (2013.01); C22C 38/005 (2013.01); H01F 1/058 (2013.01); H01F 1/059 (2013.01); H01F 1/0556 (2013.01); H01F 1/0557 (2013.01);
Abstract
To provide a permanent magnet which uses Ce of an abundant resource and has a great magnetic anisotropy in rare earth permanent magnets. To obtain a permanent magnet having a high magnetic anisotropy due to the trivalent Ce state by setting the abundance ratio C3/(C3+C4) in the main phase grains to be 0.1≤C3/(C3+C4)≤0.5 where C3 denotes the number of trivalent Ce atoms and C4 denotes the number of tetravalent Ce atoms.