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:
Apr. 30, 1996
Filed:
Oct. 12, 1994
Kenichi Takeda, Yokohama, JP;
Tatsuya Tada, Yokohama, JP;
Nobuyuki Itoh, Oume, JP;
Masao Nakano, Kamakura, JP;
Kazuhisa Kemmochi, Yokohama, JP;
Isami Itoh, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A toner for electrophotography, comprising toner particles and an additive, is obtained by mixing toners A and B together which are obtained by respectively adding the additive to each of at least two toner particle groups (a) and (b) having different particle size distributions. The average particle size of the toner particle group (a) is smaller than that of the toner particle group (b), and the amount of additive in the toner A is larger than that in the toner B. The toner reduces the differences in development conditions between different particle sizes due to broadening of toner particle size distribution, thereby enabling a stable image quality to be obtained which maintains a high image density for an extended period of time and is relatively free from fog generation in non-image portions.