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:
Mar. 27, 2012
Filed:
Apr. 11, 2008
Applicants:
Hiroya Kobayashi, Osaka, JP;
Futoshi Kuniyoshi, Osaka, JP;
Inventors:
Hiroya Kobayashi, Osaka, JP;
Futoshi Kuniyoshi, Osaka, JP;
Assignee:
Hitachi Metals, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F 1/057 (2006.01);
U.S. Cl.
CPC ...
Abstract
An R-T-B based sintered magnet includes both a light rare-earth element R(which is at least one of Nd and Pr) and a heavy rare-earth element R(which is at least one of Dy and Tb) and NdFeB type crystals as a main phase. The magnet has a first region, which includes either the heavy rare-earth element Rin a relatively low concentration or no heavy rare-earth elements Rat all, and a second region, which includes the heavy rare-earth element Rin a relatively high concentration. The first and second regions are combined together by going through a sintering process.