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. 19, 2015
Filed:
Nov. 02, 2011
Applicants:
Yuka Mizoguchi, Shizuoka, JP;
Hideki Sugiura, Shizuoka, JP;
Azumi Miyaake, Shizuoka, JP;
Inventors:
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G03G 9/093 (2006.01); G03G 9/087 (2006.01); G03G 15/20 (2006.01);
U.S. Cl.
CPC ...
G03G 9/093 (2013.01); G03G 9/08755 (2013.01); G03G 9/08797 (2013.01); G03G 9/09328 (2013.01); G03G 9/09371 (2013.01); G03G 9/09392 (2013.01); G03G 15/2064 (2013.01);
Abstract
A toner including a binder resin and a colorant, the toner having a core-shell structure containing a core and a shell, wherein the binder resin contains a crystalline polyester resin and a non-crystalline polyester resin, wherein a ratio (A/B) of a mass (A) of the crystalline polyester resin to a mass (B) of the non-crystalline polyester resin is 5/95 to 75/25, and wherein a ratio (Ds/Dc) of a hardness (Ds) of the shell to hardness (Dc) of the core is 1.05 to 1.50 where the hardnesses (Ds) and (Dc) are measured with a scanning probe microscope.