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:
Dec. 04, 1984
Filed:
Dec. 14, 1982
Applicant:
Inventors:
Kazuo Nakata, Moriyama, JP;
Tsuneo Ishikawa, Kawanishi, JP;
Ichiro Honma, Moriyama, JP;
Arata Koyama, Moriyama, JP;
Masaharu Hirai, Shiga, JP;
Masatoshi Amano, Moriyama, JP;
Assignee:
Ishihara Sangyo Kaisha, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01G / ;
U.S. Cl.
CPC ...
427129 ; 252 6256 ; 427127 ; 427130 ;
Abstract
A phosphorus-containing magnetic iron oxide powder is subjected to the activation with an aqueous alkaline medium under pressure and then coated with a cobalt compound or a cobalt compound and other metallic compound(s) to produce a cobalt-containing magnetic iron oxide powder. The magnetic iron oxide powder obtained according to this process finds its best application to the production of magnetic recording media.