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:
Mar. 08, 2016
Filed:
Jul. 13, 2011
Applicants:
Noritaka Miyamoto, Toyota, JP;
Shinya Omura, Aichi-ken, JP;
Inventors:
Noritaka Miyamoto, Toyota, JP;
Shinya Omura, Aichi-ken, JP;
Assignee:
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi-ken, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01F 7/02 (2006.01); H01F 1/01 (2006.01); H01F 41/00 (2006.01); H01F 41/02 (2006.01); H01F 1/057 (2006.01);
U.S. Cl.
CPC ...
H01F 1/01 (2013.01); H01F 41/005 (2013.01); H01F 41/0293 (2013.01); H01F 1/0577 (2013.01);
Abstract
A permanent magnet has a grain structure that includes a main phase and a grain boundary phase that is primarily composed of a first metal. A second metal that enhances the coercivity of the permanent magnet and a third metal that has a lower standard free energy of oxide formation than the first metal and the second metal are diffused in the permanent magnet, and the third metal is present in the form of an oxide in the grain boundary phase.