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. 31, 2000
Filed:
Oct. 27, 1998
Applicant:
Inventors:
Makoto Sato, Tochigi-ken, JP;
Hideyuki Kobayashi, Tochigi-ken, JP;
Kazutaka Yamashita, Tochigi-ken, JP;
Assignee:
Kao Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
428141 ; 4286 / ; 428900 ;
Abstract
A magnetic recording medium in which the bearing ratio Tp of the magnetic layer on a slice level at a depth of 45 nm from the highest peak of the surface profile measured with an atomic force microscope is 3% to 60%, and the difference .DELTA..mu. between the maximum frictional coefficient and the minimum frictional coefficient of the magnetic layer ranges from 0.1 to 0.0001 as measured under conditions of 5 mm.sup.2 in contact area, 2 g in weight of a measuring head, 0.04 to 0.2 N in load applied, 3 mm/sec in speed, and 140 mm in length of measurement.