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:
Sep. 03, 1985
Filed:
Apr. 05, 1983
Applicant:
Inventors:
Assignee:
Ishihara Sangyo Kaisha, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B / ;
U.S. Cl.
CPC ...
428403 ; 427127 ; 4273722 ; 4273770 ; 4273833 ;
Abstract
A process for producing a magnetic powder which comprises coating the particle surfaces of a magnetic iron oxide with a cobalt compound or a cobalt compound and a ferrous compound and further coating with a compound of at least one metal selected from the group consisting of manganese, vanadium and zinc. There is obtained a magnetic powder having high coercivity and excellent dispersibility in organic binders. This magnetic powder is useful as a material for recording media such as magnetic tapes.