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:
Nov. 07, 2006
Filed:
Jun. 21, 2005
Nobuo Yamazaki, Kanagawa, JP;
Masatoshi Takahashi, Kanagawa, JP;
Akira Manabe, Shizuoka, JP;
Hiroyuki Suzuki, Shizuoka, JP;
Nobuo Yamazaki, Kanagawa, JP;
Masatoshi Takahashi, Kanagawa, JP;
Akira Manabe, Shizuoka, JP;
Hiroyuki Suzuki, Shizuoka, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Asahi Techno Glass Corporation, Chiba, JP;
Abstract
A hexagonal ferrite magnetic powder having an average tabular diameter of from 15 to 30 nm, a coercive force (Hc) of from 2,000 to 5,000 Oe (from 160 to 400 kA/m) and a saturated magnetization (σs) of equal to or more than the average tabular diameter (nm)×0.37+45 A·m/kg. This magnetic powder is obtained by melting a starting material containing a material which has a composition within the hatched region () in the triangular phase diagram shown in FIG.and quenching the molten product to obtain an amorphous product, subjecting the amorphous product to a thermal treatment, acid treatment, and washing. Also, a magnetic recording medium is obtained by adding this magnetic powder to the magnetic layer and coating it on the support.