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. 04, 2021
Filed:
Dec. 25, 2017
Applicant:
Powdertech Co., Ltd., Kashiwa-shi, Chiba, JP;
Inventors:
Hiroki Sawamoto, Kashiwa, JP;
Tetsuya Uemura, Kashiwa, JP;
Assignee:
POWDERTECH CO., LTD., Kashiwa-Shi, Chiba, JP;
Primary Examiner:
Int. Cl.
CPC ...
G03G 9/113 (2006.01); G03G 9/107 (2006.01); G03G 9/10 (2006.01); G03G 9/083 (2006.01);
U.S. Cl.
CPC ...
G03G 9/0835 (2013.01); G03G 9/0837 (2013.01); G03G 9/1075 (2013.01); G03G 9/1085 (2020.08); G03G 9/113 (2013.01);
Abstract
Provided are a magnetic core material for electrophotographic developer and a carrier for electrophotographic developer, which are excellent in charge characteristics and strength and with which a satisfactory image free from defects can be obtained, and a developer containing the carrier. A magnetic core material for electrophotographic developer, having a sulfur component content of from 50 to 700 ppm in terms of a sulfate ion and a BET specific surface area of from 0.06 to 0.25 m/g.