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:
Feb. 15, 2005
Filed:
Nov. 16, 2000
Takashi Yamamoto, Kawasaki, JP;
Masae Nakamura, Kawasaki, JP;
Masakazu Kinoshita, Kato, JP;
Yoshimichi Katagiri, Kawasaki, JP;
Shin-ichi Kuramoto, Numazu, JP;
Hachiro Tosaka, Shizuoka, JP;
Hiroshi Yamashita, Numazu, JP;
Osamu Uchinokura, Shizuoka, JP;
Takashi Yamamoto, Kawasaki, JP;
Masae Nakamura, Kawasaki, JP;
Masakazu Kinoshita, Kato, JP;
Yoshimichi Katagiri, Kawasaki, JP;
Shin-ichi Kuramoto, Numazu, JP;
Hachiro Tosaka, Shizuoka, JP;
Hiroshi Yamashita, Numazu, JP;
Osamu Uchinokura, Shizuoka, JP;
Fujitsu Limited, Kawasaki, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
In a method for forming a multicolored toner image in accordance with an electrophotographic process, the addition amount of external additives to a non-added toner is 1.5 to 10.0 parts by weight per 100 parts by weight of the non-added toner in each developing step, the aggregation degree of the toner is within the range of 30 to 80%, and the change ratio of the aggregation degree satisfies the relation:0.8≦(initial aggregation degree/aggregation degree after no-load revolution of developing portion for 20 hours)≦1.2. According to this method, it becomes possible to form a high-quality color image while a toner always keeps a stable degree of aggregation and a charge amount.