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, 1989
Filed:
Aug. 18, 1988
Applicant:
Inventors:
Shigefumi Kuroyama, Yokohama, JP;
Kenichi Okazaki, Kawasaki, JP;
Assignee:
Showa Denko Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C01G / ;
U.S. Cl.
CPC ...
427127 ; 252 6256 ; 252 6263 ; 427131 ;
Abstract
Magnetic particles of modified .gamma.-ferric oxide particles for magnetic recording media which have excellent electrical conductivity, saturation magnetization, and print-through, and have a higher coercivity, are prepared by modifying .gamma.-ferric oxide particles first with cobalt and then with ferrous iron, both in the presence of an alkaline earth metal salt in an alkaline solution containing the .gamma.-ferric oxide particles dispersed therein.
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Kuroyama, Shigefumi. (1989). Method for preparing magnetic particles for magnetic-recording media (U.S. Patent No. 4851258). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4851258
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile