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:
Oct. 29, 1991
Filed:
Mar. 30, 1990
Applicant:
Inventors:
Kunio Okumori, Mishima, JP;
Kazuo Terada, Mishima, JP;
Assignee:
Sumitomo Special Metal Co. Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C04B / ; C04B / ;
U.S. Cl.
CPC ...
264 24 ; 252 6263 ; 264 63 ; 264118 ; 264122 ; 264125 ; 264D / ;
Abstract
An iron ore or mill scale is crushed to form a powder having an average particle diameter not exceeding 12 microns. The powder is heated at a temperature of 600.degree. C. to 900.degree. C. in the presence of oxygen to form an iron oxide containing at least 98.0% of Fe.sub.2 O.sub.3. The iron oxide is mixed with strontium oxide or carbonate. The mixture is calcined to form strontium ferrite. The calcined product is pulverized, the crushed material is molded in a magnetic field, and the molded product is sintered to yield a magnet of strontium ferrite having a high level of performance.