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:
Oct. 29, 2002
Filed:
Sep. 29, 2000
Applicant:
Inventor:
Yasuo Kakihara, Hiroshima, JP;
Assignee:
Toda Kogyo Corporation, Hiroshima-ken, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B 5/65 ;
U.S. Cl.
CPC ...
G11B 5/65 ;
Abstract
A magnetic recording medium having an excellent surface smoothness comprising a substrate and a maghemite thin film formed on the substrate. The maghemite thin film has a thickness of 10 to 50 nm and a surface roughness represented by an average surface roughness (Ra) of 0.1 to 0.7 nm and a max height (Rmax) of 1 to 10 nm. The magnetic recording medium exhibits an excellent surface smoothness without deterioration in high coercive force.