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:
May. 19, 2015
Filed:
Mar. 01, 2012
Applicants:
Tomohide Iida, Okayama, JP;
Tomoya Yamada, Okayama, JP;
Takashi Fujiwara, 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 9/113 (2006.01); G03G 9/10 (2006.01); G03G 9/107 (2006.01);
U.S. Cl.
CPC ...
G03G 9/10 (2013.01); G03G 9/107 (2013.01); G03G 9/1075 (2013.01); G03G 9/1131 (2013.01); G03G 9/113 (2013.01); G03G 9/1136 (2013.01);
Abstract
The carrier core particles for electrophotographic developer have a volume size distribution with a median particle size ranging from 30 μm to 40 μm, the ratio of the carrier core particles having a diameter of 22 μm or lower in the volume size distribution is from 1.0% to 2.0%, the ratio of the carrier core particles having a diameter of 22 μm or lower in a number size distribution is 10% or lower, and the magnetization of the carrier core particles in an external magnetic field of 1000 Oe is from 50 emu/g to 75 emu/g.