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:
Jun. 05, 2007
Filed:
Jun. 09, 2003
Applicants:
Tomio Hayashi, Tamano, JP;
Hiroyuki Shimamura, Tokyo, JP;
Inventors:
Tomio Hayashi, Tamano, JP;
Hiroyuki Shimamura, Tokyo, JP;
Assignee:
Mitsui Mining & Smelting Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01G 49/08 (2006.01); H01F 1/11 (2006.01); G03G 9/083 (2006.01);
U.S. Cl.
CPC ...
Abstract
Magnetite particles (and their manufacturing method) that enable suppression of blooming caused because of their large coercive force when used as magnetic toner, exert a light environment load, and are excellent in cost. The magnetite particles contain 0.1 to 1 mass % of phosphorus, have a coercive force of 10 to 25 kA/m at a load magnetic field of 796 kA/m, and have a shape of octahedron.