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:
Aug. 26, 2025
Filed:
Dec. 24, 2020
Proterial, Ltd., Tokyo, JP;
Nobuhiko Fujimori, Tokyo, JP;
Tohru Obata, Yabu, JP;
Kazuhiro Sonoda, Yabu, JP;
Futoshi Kuniyoshi, Tokyo, JP;
Daisuke Furusawa, Tokyo, JP;
Tomohito Maki, Tokyo, JP;
Shuji Mino, Tokyo, JP;
Kouta Saitou, Tokyo, JP;
PROTERIAL, LTD., Tokyo, JP;
Abstract
A method for manufacturing an R-T-B based sintered magnet according the present disclosure comprises: a step for preparing a coarse ground powder which is made from an alloy for R-T-B based sintered magnets and which has an average particle size of 10-500 μm; a step for obtaining a fine powder having an average particle size of 2.0-4.5 μm, by feeding the coarse ground powder to a jet mill device that has a grinding chamber filled with inert gas and grinding the coarse ground powder; and a step for producing a sintered body of the fine powder, wherein the inert gas has been humidified, and the oxygen content of the R-T-B based sintered magnet is 1000-3500 ppm by mass.