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. 15, 2006
Filed:
Nov. 13, 2003
Applicants:
Tadao Nomura, Takefu, JP;
Takehisa Minowa, Takefu, JP;
Inventors:
Tadao Nomura, Takefu, JP;
Takehisa Minowa, Takefu, JP;
Assignee:
Shin-Etsu Chemical Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F 1/057 (2006.01);
U.S. Cl.
CPC ...
Abstract
An R—Fe—B base sintered magnet having a composition of 12–17 at % of R (wherein R stands for at least two of yttrium and rare earth elements and essentially contains Nd and Pr), 0.1–3 at % of Si, 5–5.9 at % of B, 0–10 at % of Co, and the balance of Fe, containing a R(Fe,(Co),Si)B intermetallic compound primary phase and at least 1% by volume of an R—Fe(Co)—Si grain boundary phase, and being free of a B-rich phase exhibits a coercive force of at least 10 kOe despite a reduced content of heavy rare earth.