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. 10, 2011
Filed:
Mar. 13, 2008
Takahiro Honda, Fujinomiya, JP;
Hiroyuki Fushimi, Numazu, JP;
Fumihiro Sasaki, Fuji, JP;
Hisashi Nakajima, Numazu, JP;
Hiroshi Yamada, Numazu, JP;
Yasuo Asahina, Numazu, JP;
Takahiro Honda, Fujinomiya, JP;
Hiroyuki Fushimi, Numazu, JP;
Fumihiro Sasaki, Fuji, JP;
Hisashi Nakajima, Numazu, JP;
Hiroshi Yamada, Numazu, JP;
Yasuo Asahina, Numazu, JP;
Ricoh Company Limited, Tokyo, JP;
Abstract
A toner includes a polyol-based resin having multiple hydroxyl groups in a molecular chain thereof in which a ratio of epoxy group to hydroxyl group is from 0.990 to 1.010. A stirring and transfer device satisfies 1000000≦α×β×γ≦16000000, wherein α represents a number of rotation per minute, β (mm) represents a pitch and γ (mm) represents a transfer path length of the stirring and transfer device. A temperature Tin (° C.) in a development device during stirring and transfer of a two component developing agent satisfies 3020 C.<Tin<60° C., and the toner satisfies Y≦−0.5X+45, 5≦X<40, 5≦Y≦35, wherein X (%) represents a degree of agglomeration of a mother toner particle and Y (%) represents a degree of agglomeration of the toner which has been preserved at 55° C. for 24 hours.