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:
Sep. 25, 2007
Filed:
Jul. 29, 2004
Tsutomu Onuma, Kanagawa, JP;
Nobuyuki Okubo, Shizuoka, JP;
Hideto Iida, Chiba, JP;
Takashige Kasuya, Shizuoka, JP;
Koji Nishikawa, Shizuoka, JP;
Shuhei Moribe, Shizuoka, JP;
Tsutomu Onuma, Kanagawa, JP;
Nobuyuki Okubo, Shizuoka, JP;
Hideto Iida, Chiba, JP;
Takashige Kasuya, Shizuoka, JP;
Koji Nishikawa, Shizuoka, JP;
Shuhei Moribe, Shizuoka, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
In a toner comprising toner particles which comprise toner base particles containing at least a binder resin and a magnetic material, and inorganic fine particles, the toner base particles have been obtained through a pulverization step; and, the toner base particles having a circle-equivalent diameter of from 3 μm or more to 400 μm or less as measured with a flow type particle image analyzer have an average circularity of from 0.935 or more to less than 0.970; and the toner base particles have an average surface roughness of from 5.0 nm or more to less than 35.0 nm as measured with a scanning probe microscope. The toner can enjoy less toner consumption per sheet of images, can achieve a long lifetime in a smaller quantity of toner, and has superior developing performance in any environment.