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. 26, 1993
Filed:
Jul. 31, 1991
Applicant:
Inventors:
Akira Miyake, Kyoto, JP;
Mikio Kishimoto, Osaka, JP;
Masaya Funahashi, Osaka, JP;
Teruhisa Miyata, Kyoto, JP;
Hitoshi Nagatani, Kyoto, JP;
Assignee:
Hitachi Maxell, Ltd., Ibaraki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F / ;
U.S. Cl.
CPC ...
428336 ; 427131 ; 428693 ; 4286 / ; 428900 ; 4286 / ;
Abstract
A magnetic recording medium suitable for high density recording having improved erasing characteristics is produced by a method comprising the steps of forming an under coat layer containing an electrically conductive material on at least one surface of a substrate, applying a magnetic paint containing hexagonal system ferrite magnetic powder on the under coat layer and drying the applied magnetic paint to form a magnetic layer having a thickness of not larger than 0.7 .mu.m.