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:
Apr. 04, 1989
Filed:
Feb. 10, 1987
Applicant:
Inventor:
Shizuo Furuyama, Katano, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ;
U.S. Cl.
CPC ...
428327 ; 428328 ; 428329 ; 428694 ; 428900 ;
Abstract
A magnetic recording medium comprising a non-magnetic substrate and a magnetic layer which is formed on the substrate and comprises a magnetic powder and an abrasive material consisting of .alpha.-alumina particles as a first component and at least one second particulate component selected from the group consisting of SiC, TiO.sub.2, TiC, .alpha.-Fe.sub.2 O.sub.3, Cr.sub.2 O.sub.3, fluorocarbon and benzoguanamine, which has good abrasion property and improved abrasion resistance.