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. 21, 1992
Filed:
Aug. 07, 1990
Applicant:
Inventors:
Hiroyuki Yamada, Saku, JP;
Norifumi Kajimoto, Saku, JP;
Assignee:
TDK Corporation, , JP;
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
428329 ; 428694 ; 428900 ;
Abstract
In a magnetic recording medium comprising a magnetic layer of a ferromagnetic powder dispersed in a resin binder and a nonmagnetic substrate for the layer, the magnetic layer contains zine aluminate (ZnAl.sub.2 O.sub.4) powder. The ferromagnetic powder is of chromium dioxide (CrO.sub.2) and the ZnAl.sub.2 O.sub.4 content in the magnetic layer is 0.01-1 wt % on the basis of the weight of the ferromagnetic powder.