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. 17, 2017
Filed:
Mar. 29, 2011
Makoto Iwasaki, Chuo-ku, JP;
Ryota Kunieda, Chuo-ku, JP;
Fumitaka Baba, Chuo-ku, JP;
Satoshi Tanaka, Chuo-ku, JP;
Yoshinori Fujikawa, Chuo-ku, JP;
Makoto Iwasaki, Chuo-ku, JP;
Ryota Kunieda, Chuo-ku, JP;
Fumitaka Baba, Chuo-ku, JP;
Satoshi Tanaka, Chuo-ku, JP;
Yoshinori Fujikawa, Chuo-ku, JP;
TDK CORPORATION, Tokyo, JP;
Abstract
The present invention provides a sintered magnet having superior residual magnetic flux density and coercive force. The sintered magnet of the present invention comprises a group of R-T-B based rare earth magnet crystal particleshaving a coreand a shellcovering the core, the mass ratio of a heavy rare earth element in the shellis higher than the mass ratio of a heavy rare earth element in the core, and the thickest part of the shellin the crystal particlesfaces a grain boundary triple junction. A lattice defectis formed between the coreand the shell