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:
Jun. 02, 2008
Filed:
Nov. 04, 2003
Hisato Tokoro, Saitama-ken, JP;
Kimio Uchida, Saitama-ken, JP;
Kazuo Oda, Saitama-ken, JP;
Tsukasa Mikamoto, Saitama-ken, JP;
Hisato Tokoro, Saitama-ken, JP;
Kimio Uchida, Saitama-ken, JP;
Kazuo Oda, Saitama-ken, JP;
Tsukasa Mikamoto, Saitama-ken, JP;
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
A thin arc segment magnet made ofaan R--rare earth sintered magnet substantially comprising 28-33 weight % of R and 0.8-1.5 weight % of B, the balance being substantiallyFeT, wherein R is at least one rare earth element including Y, and T is Fe or Fe and Co, which has an oxygen content of 0.3 weight % or less, a density of 7.56 g/cmor more, a coercivity iHc of 1.1 MA/m (14 kOe) or more at room temperature, and an orientation Br/4πIof 96% or more in an anisotropy-providing direction at room temperature can be produced by using a slurry mixture formed by introducing fine alloy powder of the above composition into a mixture liquid comprising 99.7-99.99 parts by weight of a mineral oil, a synthetic oil or a vegetable oil and 0.01-0.3 parts by weight of a nonionic surfactant and/or an anionic surfactant.