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:
May. 22, 2012
Filed:
Nov. 30, 2006
Noriyuki Nozawa, Osaka, JP;
Tomoori Odaka, Osaka, JP;
Yutaka Matsuura, Osaka, JP;
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
A sintered rare-earth magnet includes an NdFeB type crystalline phase as its main phase and Al as an additive. The magnet includes at least one light rare-earth element LR selected from the group consisting of yttrium and the rare-earth elements other than Dy, Ho and Tb, and at least one heavy rare-earth element HR selected from the group consisting of Dy, Ho and Tb. The mole fractions α1, α2 and β of the light and heavy rare-earth elements LR and HR and Al satisfy the inequalities 25≦α1+α2≦40 mass %, 0<α2≦40 mass %, β>0.20 mass %, and 0.04≦β/α2≦0.12.