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. 22, 2013
Filed:
Aug. 30, 2011
Applicant:
Yuki Matsuura, Tokyo, JP;
Inventor:
Yuki Matsuura, Tokyo, JP;
Assignee:
Oki Data Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03G 9/08 (2006.01);
U.S. Cl.
CPC ...
Abstract
A negatively chargeable developer includes: negatively chargeable toner mother particles including at least binding resin and colorant; and an external additive that is externally added to a surface of the toner mother particles, wherein the external additive includes polymethyl methacrylate that is within a range from approximately 0.4 parts by weight to approximately 0.8 parts by weight inclusive per 100 parts by weight of the toner mother particles and that has positive chargeability.