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:
Feb. 26, 1985
Filed:
Sep. 29, 1982
Kokichi Miyazawa, Suzuka, JP;
Kazuo Nakata, Moriyama, JP;
Tsuneo Ishikawa, Kawanishi, JP;
Ichiro Honma, Moriyama, JP;
Masaharu Hirai, Shiga, JP;
Makoto Ogasawara, Moriyama, JP;
Toshihiko Kawamura, Moriyama, JP;
Ishihara Sangyo Kaisha, Ltd., Osaka, JP;
Abstract
A process is provided for coating the particle surfaces of a phosphor-containing magnetic iron oxide powder with a cobalt compound after subjecting said powder to an activation treatment with an aqueous alkaline and/or acidic medium. The cobalt-containing magnetic iron oxide powder obtained according to this process has excellent coercivity and thermal stability, and the magnetic tape produced by using said powder has not only high coercivity but also excellent squareness, orientability and remanent induction.