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:
Nov. 29, 2016
Filed:
Feb. 26, 2014
Applicants:
Dowa Electronics Materials Co., Ltd., Tokyo, JP;
Dowa Ip Creation Co., Ltd., Okayama, Okayama, JP;
Inventors:
Assignees:
DOWA ELECTRONICS MATERIALS CO., LTD., Tokyo, JP;
DOWA IP CREATION CO., LTD., Okayama, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03G 9/107 (2006.01); C01G 49/00 (2006.01); G03G 9/08 (2006.01); G03G 9/113 (2006.01);
U.S. Cl.
CPC ...
G03G 9/107 (2013.01); C01G 49/0036 (2013.01); C01G 49/0072 (2013.01); G03G 9/0806 (2013.01); G03G 9/1136 (2013.01); C01P 2004/03 (2013.01); C01P 2004/61 (2013.01); C01P 2006/10 (2013.01); C01P 2006/42 (2013.01);
Abstract
There are provided ferrite particles in which Mn ferrite is used as the main phase and which contain Sr ferrite, where the degree of projections and recesses in the surface of the particles falls within a range of 2.5 to 4.5 μm, and the standard deviation of the size of grains appearing on the surface of the particles falls within a range of 1.5 to 3.5 μm. In this way, a coating resin is left on the surface of the particles even after long-term use and thus a decrease in the charging property is reduced.