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:
Oct. 09, 2018
Filed:
Mar. 28, 2014
Applicant:
Tdk Corporation, Tokyo, JP;
Inventors:
Eiji Kato, Tokyo, JP;
Yoshinori Fujikawa, Tokyo, JP;
Taeko Tsubokura, Tokyo, JP;
Chikara Ishizaka, Tokyo, JP;
Katsuo Sato, Ichikawa, JP;
Assignee:
TDK CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F 1/153 (2006.01); H01F 1/053 (2006.01); H01F 1/057 (2006.01); H01F 41/02 (2006.01);
U.S. Cl.
CPC ...
H01F 1/0577 (2013.01); H01F 41/0273 (2013.01);
Abstract
The present invention provides a rare earth based magnet including RTB main-phase crystal grains, and two-grain boundary phases between adjacent two RTB main-phase crystal grains, the two-grain boundary phases are controlled such that the thickness thereof is 5 nm or more and 500 nm or less, and it is composed of a phase with a magnetism different from that of a ferromagnet.