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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.:

US 8945318 B1

PDFFull Text
Date of Patent:
Feb. 03, 2015

Filed:

Apr. 26, 2012

R-fe-b type rare earth sintered magnet and process for production of the same

Applicants:

Koshi Yoshimura, Osaka, JP;

Hideyuki Morimoto, Osaka, JP;

Tomoori Odaka, Osaka, JP;

Inventors:

Koshi Yoshimura, Osaka, JP;

Hideyuki Morimoto, Osaka, JP;

Tomoori Odaka, Osaka, JP;

Assignee:

Hitachi Metals, Ltd., Tokyo, JP;

Attorney:

Keating & Bennett, LLP

Primary Examiner:

Jie Yang

Int. Cl.
CPC ...
H01F 7/02 (2006.01); C22C 38/00 (2006.01); B22F 3/24 (2006.01); C22C 33/02 (2006.01); H01F 1/057 (2006.01); H01F 41/02 (2006.01);
U.S. Cl.
CPC ...
C22C 38/005 (2013.01); B22F 3/24 (2013.01); C22C 33/0278 (2013.01); H01F 1/0577 (2013.01); H01F 41/0293 (2013.01); B22F 2003/248 (2013.01); B22F 2999/00 (2013.01); C22C 2202/02 (2013.01);
Abstract

In an R—Fe—B based rare-earth sintered magnet according to the present invention, at a depth of 20 μm under the surface of its magnet body, crystal grains of an RFeB type compound have an (RLRH)FeB (where 0.2≦x≦0.75) layer with a thickness of 1 nm to 2 μm in their outer periphery. In this case, the light rare-earth element RL is at least one of Nd and Pr, and the heavy rare-earth element RH is at least one element selected from the group consisting of Dy, Ho and Tb.

Find Patent Forward Citations

Yoshimura, Koshi. (2015). R-fe-b type rare earth sintered magnet and process for production of the same (U.S. Patent No. 8945318). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/8945318

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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