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:
Jul. 25, 2000
Filed:
Oct. 30, 1998
Applicant:
Inventors:
Kazuhiro Takeda, Mito, JP;
Kuniharu Fujiki, Mito, JP;
Assignee:
Victor Company of Japan, Ltd., Yokohama, JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
428323 ; 428328 ; 428329 ; 4284259 ; 4286 / ; 4286 / ; 4286 / ; 428900 ; 252 6254 ;
Abstract
Magnetic paint for producing a magnetic recording medium, the magnetic paint comprises at least ferromagnetic powder, binder, .alpha.-Fe.sub.2 O.sub.3 powder, and alumina powder. A relationship between an additive amount (A) of the .alpha.-Fe.sub.2 O.sub.3 powder and an additive amount (B) of the alumina powder is 5.ltoreq.(A+B).ltoreq.25 weight-parts referred to 100 weight-parts of the ferromagnetic powder and 1.ltoreq.A/B.ltoreq.9. The binder comprises polyurethane resin containing metal base sulfonic acid and tertiary amine as major ingredients.