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. 09, 1993
Filed:
Mar. 26, 1991
Hiroaki Ichikawa, Wakayama, JP;
Yasuo Kadono, Wakayama, JP;
Katsuo Kojima, Wakayama, JP;
Hiroyuki Nakamura, Wakayama, JP;
Yoshio Aoki, Wakayama, JP;
Kao Corporation, Tokyo, JP;
Abstract
A magnetic metal powder, having a large specific surface are, a high coercive force, a high dispersibility and an excellent corrosion resistance, is produced by converting an aciculate goethite having a silicon and/or aluminum compound layer formed thereon or an aciculate goethite modified with a metal other than iron into magnetite, forming thereon a nonferrous transition metal compound layer, further forming thereon a silicon or aluminum compound layer, and reducing the coated magnetite to prepare a magnetic metal powder mainly composed of iron and having on the surface thereof a layer containing a nonferrous transition metal element, characterized in that the formation of the silicon and/or aluminum compound layer on the aciculate goethite and/or the formation of the nonferrous transition metal layer on the magnetite are conducted while conducting dispersion by means of a disperser.