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:
May. 09, 1989
Filed:
Jun. 18, 1986
Applicant:
Inventors:
Akira Miyake, Otokuni, JP;
Hitoshi Nagatani, Otokuni, JP;
Tsugihiro Doi, Otokuni, JP;
Kunio Mizushima, Tsukuba, JP;
Akito Sakemoto, Tsukuba, JP;
Assignee:
Hitachi Maxell, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
4284259 ; 252 6254 ; 427128 ; 428694 ; 428695 ; 428900 ;
Abstract
A magnetic disc which comprises a non-magnetic support substrate and a magnetic layer thereon consisting of a magnetic coating comprising ferromagnetic powder, a binder, an aliphatic acid ester having a melting point not higher than 10.degree. C. and an aliphatic acid ester having a melting point from 15.degree. to 60.degree. C., the magnetic coating having improved lubricity and durability.