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. 27, 2010
Filed:
Sep. 21, 2009
Naotaka Ikeda, Suntou-gun, JP;
Shinya Yachi, Mishima, JP;
Katsuyuki Nonaka, Mishima, JP;
Emi Watanabe, Suntou-gun, JP;
Koji Abe, Numazu, JP;
Nobuhisa Abe, Susono, JP;
Naotaka Ikeda, Suntou-gun, JP;
Shinya Yachi, Mishima, JP;
Katsuyuki Nonaka, Mishima, JP;
Emi Watanabe, Suntou-gun, JP;
Koji Abe, Numazu, JP;
Nobuhisa Abe, Susono, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A toner is provided which has toner particles and a fine silica powder mixed by external addition to the toner particles. The toner has a weight average particle diameter of 4.0 to 9.0 μm. The fine silica powder is subjected to hydrophobic treatment with dimethylsilicone oil, and has, in particle size distribution based on volume, a peak at which cumulative frequency is largest, in the measurement range of 0.02 μm to 1,000.00 μm; the cumulative frequency of 0.10 μm to less than 1.00 μm being 7.0% or less, and, the fine silica powder fulfills the following conditions: