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. 03, 2008
Filed:
Jun. 20, 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;
Asahi Techno Glass Corporation, Chiba, JP;
FUJIFILM Corporation, Tokyo, JP;
Abstract
A hexagonal ferrite magnetic powder having an average tabular diameter of from 15 to 28 nm, a coercive force (Hc) of from 2,000 to 5,000 Oe (from 160 to 400 kA/m), a switching field distribution (SFD) of from 0.3 to 0.7 and a D/Dof from 1.05 to 1.25. This magnetic powder can be obtained by melting and quenching starting materials to obtain an amorphous product, and thermally treating the product, which comprises increasing a temperature at a rate of 300 to 500° C./hr in a temperature range of 550 to 600° C. in the thermal treatment before the temperature reaches the thermally treating temperature.