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. 22, 2019
Filed:
Apr. 15, 2016
Applicant:
Tdk Corporation, Tokyo, JP;
Inventor:
Atsushi Tada, Tokyo, JP;
Assignee:
TDK CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F 1/053 (2006.01); H01F 1/057 (2006.01);
U.S. Cl.
CPC ...
H01F 1/0536 (2013.01); H01F 1/0577 (2013.01);
Abstract
An R-T-B based sintered magnet including a main phase composed of an RTB (wherein, R is at least one selected from the group consisting of Y, Ce, La, Pr, Nd, Sm, Eu and Gd; and T is one or more transition metal elements with Fe as necessity) structure, wherein the R-T-B based sintered magnet has a grain boundary phase containing Ce, Fe and Co, and the cross-section area ratio of the grain boundary phase containing Ce, Fe and Co in a unit cross-section area is 1.0% or more and 5.0% or less.