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:
Apr. 03, 2007
Filed:
Mar. 24, 2004
Tetsuya Hidaka, Tokyo, JP;
Kazuya Sakamoto, Tokyo, JP;
Kazuo Sato, Tokyo, JP;
Hironari Okada, Tokyo, JP;
Tetsuya Hidaka, Tokyo, JP;
Kazuya Sakamoto, Tokyo, JP;
Kazuo Sato, Tokyo, JP;
Hironari Okada, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
An R-T-B system rare earth permanent is provided, which comprises a sintered body comprising: an RTB phase (wherein R represents one or more rare earth elements (providing that the rare earth elements include Y) and T represents one or more transition metal elements essentially containing Fe, or Fe and Co) as a main phase; and a grain boundary phase containing a higher amount of R than the above main phase, wherein, when Pc (permeance coefficient) is 2, if a total flux is defined as funder the application of an effective magnetic field of 240 kA/m (providing that an effective magnetic field=an applied magnetic field−a demagnetizing field, and each value of them is absolute value), if a total flux is defined as funder the application of an effective magnetic field of 800 kA/m, and if a total flux is defined as funder the application of an effective magnetic field of 2,000 kA/m, a magnetization rate a (=f/f×100) is 40% or more, and a magnetization rate b (=f/f×100) is 90% or more.