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. 27, 2002
Filed:
Aug. 09, 2000
Applicant:
Inventors:
Seiichi Hisano, Chiba, JP;
Kazuhisa Saito, Okayama, JP;
Kazushi Sano, Okayama, JP;
Yoshichika Horikawa, Okayama, JP;
Assignee:
Dowa Mining Co., Ltd., Tokyo, US;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 5/16 ;
U.S. Cl.
CPC ...
G11B 5/16 ;
Abstract
A powder for use in the lower layer of a coating magnetic recording medium, comprising acicular particles with a mean major axis length in a range of from 0.01 to 0.5 &mgr;m and a mean minor axis length in a range of from 0.01 to 0.05 &mgr;m, provided that the acicular particles are flat acicular particles which, when cut in a direction perpendicular to the major axis, uniformly exhibit a cross section having a larger width to smaller width ratio of greater than 1, and that the quantity of discharged H O at 100° C. is in a range of from 0.1 to 2.0% by weight.