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:
Mar. 21, 2006
Filed:
Oct. 02, 2003
Shinya Yachi, Shizuoka, JP;
Yushi Mikuriya, Shizuoka, JP;
Katsuyuki Nonaka, Ibaraki, JP;
Shuntaro Watanabe, Shizuoka, JP;
Shinya Yachi, Shizuoka, JP;
Yushi Mikuriya, Shizuoka, JP;
Katsuyuki Nonaka, Ibaraki, JP;
Shuntaro Watanabe, Shizuoka, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
The present invention provides a silica fine particle capable of preventing a charging member or an image bearing member from being contaminated with toner when the toner contains the particle and also capable of providing the toner with a stable developing property. The silica fine particle of the present invention has been hydrophobic treated. Furthermore, the particle has a peak in a range of 0.04 μm to 1 μm and a peak in the range of 1 μm to 100 μm in a volume-basis particle diameter distribution. The particle has a frequency ratio of 10 to 80% for the particles with a particle diameter of 0.04 μm to 1 μm to a total of all the peaks, and the particles has the frequency ratio of less than 16% for the particles with a particle diameters of 20 μm to 2000 μm to the total of all the peaks.