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:
Apr. 06, 2021
Filed:
Jan. 15, 2018
Applicant:
Powdertech Co., Ltd., Kashiwa, JP;
Inventors:
Hiroki Sawamoto, Kashiwa, JP;
Tetsuya Uemura, Kashiwa, JP;
Assignee:
POWDERTECH CO., LTD., Kashiwa, JP;
Primary Examiner:
Int. Cl.
CPC ...
G03G 9/083 (2006.01); G03G 9/107 (2006.01); G03G 9/113 (2006.01); H01F 1/36 (2006.01);
U.S. Cl.
CPC ...
G03G 9/1075 (2013.01); G03G 9/0834 (2013.01); G03G 9/0838 (2013.01); G03G 9/113 (2013.01); H01F 1/36 (2013.01);
Abstract
Provided are a magnetic core material for electrophotographic developer and a carrier for electrophotographic developer, which are excellent in charging characteristics and strength with low specific gravity and with which a satisfactory image free of defects can be obtained, and a developer containing the carrier. A magnetic core material for electrophotographic developer, having a sulfur component content of from 60 to 800 ppm in terms of a sulfate ion and a pore volume of from 30 to 100 mm/g.