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:
Mar. 22, 2016
Filed:
Feb. 18, 2014
Applicant:
Ricoh Company, Ltd., Tokyo, JP;
Inventors:
Junichi Awamura, Shizuoka, JP;
Tsuneyasu Nagatomo, Shizuoka, JP;
Satoshi Kojima, Shizuoka, JP;
Shingo Sakashita, Shizuoka, JP;
Tomoki Murayama, Kanagawa, JP;
Masaya Fukuda, Kanagawa, JP;
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G03G 9/08 (2006.01); G03G 9/097 (2006.01); G03G 9/087 (2006.01);
U.S. Cl.
CPC ...
G03G 9/09725 (2013.01); G03G 9/0804 (2013.01); G03G 9/08755 (2013.01); G03G 9/09716 (2013.01);
Abstract
Provided is an electrostatic charge image developing toner, including: toner base particles including a polyester resin as a binder resin; and an external additive on the surface of the toner base particles. The external additive includes silica. The silica is produced by sol-gel method, and is aspherical. The percentage of change in the specific surface area of the toner when it is stored under high-temperature, high-humidity conditions is from 25% to 45%.