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:
Apr. 14, 1981
Filed:
Apr. 01, 1977
Applicant:
Inventors:
Seiichi Asada, Hachioji, JP;
Masahiro Amemiya, Takatsuki, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B05D / ;
U.S. Cl.
CPC ...
427127 ; 427130 ; 427132 ; 427217 ; 427229 ;
Abstract
A method of producing ferromagnetic metal powder comprises the steps of dipping an iron compound powder in a solution in which an aluminum compound and/or a titanium compound is dissolved, removing solvent from the iron compound powder, reducing the iron compound powder in a reducing atmosphere at an elevated temperature and forming oxide layers on whole surfaces of the individual particles of the iron powder. Ferromagnetic iron powder produced according to this method has both a high coercive force and a high remanence ratio.