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. 19, 2021
Filed:
Nov. 26, 2018
Applicant:
Powdertech Co., Ltd., Kashiwa, JP;
Inventors:
Yuzuru Yamasaki, Chiba, JP;
Takao Sugiura, Chiba, JP;
Takeshi Naito, Chiba, JP;
Tetsuya Uemura, Chiba, JP;
Assignee:
POWDERTECH CO., LTD., Chiba, JP;
Primary Examiner:
Int. Cl.
CPC ...
G03G 9/107 (2006.01); G03G 9/113 (2006.01);
U.S. Cl.
CPC ...
G03G 9/1075 (2013.01); G03G 9/107 (2013.01); G03G 9/1136 (2013.01); G03G 9/1139 (2013.01); G03G 9/1131 (2013.01);
Abstract
Provided are a ferrite carrier core material for an electrophotographic developer having a full length Lof grain boundary and a circumference length Lof the core material in a cross-section of the core material, and satisfying a relationship of 2≤L/L≤9; a carrier for an electrophotographic developer including the ferrite carrier core material and a coating layer containing a resin provided on a surface of the ferrite carrier core material; and an electrophotographic developer including the carrier and a toner.