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:
Dec. 20, 2016
Filed:
Jan. 30, 2014
Satoshi Kojima, Shizuoka, JP;
Junichi Awamura, Shizuoka, JP;
Tsuneyasu Nagatomo, Shizuoka, JP;
Shingo Sakashita, Shizuoka, JP;
Tomoki Murayama, Kanagawa, JP;
Masaya Fukuda, Kanagawa, JP;
Satoshi Kojima, Shizuoka, JP;
Junichi Awamura, Shizuoka, JP;
Tsuneyasu Nagatomo, Shizuoka, JP;
Shingo Sakashita, Shizuoka, JP;
Tomoki Murayama, Kanagawa, JP;
Masaya Fukuda, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
To provide a toner, which contains silica particles containing first silica particles, and second silica particles, wherein the toner is a toner produced by depositing the silica particles on surfaces of base particles, the first silica particles have an average primary particle diameter of 75 nm to 250 nm, the second silica particles have an average primary particle diameter of 10 nm to 50 nm, a mass ratio of the first silica particles to the base particles is 0.010 to 0.040, a mass ratio of the second silica particles to the base particles is 0.005 to 0.030, a liberation ratio of the silica particles from the toner by a ultrasonic vibration method is 5% by mass to 20% by mass, and an amount of particles having primary particle diameters of 30 nm or smaller in the silica particles librated from the toner by the ultrasonic vibration method is 20% by number or less.