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. 12, 2019
Filed:
Sep. 07, 2017
Canon Kabushiki Kaisha, Tokyo, JP;
Takuya Mizuguchi, Suntou-gun, JP;
Kazuo Terauchi, Numazu, JP;
Yojiro Hotta, Mishima, JP;
Takeshi Naka, Suntou-gun, JP;
Motohide Shiozawa, Mishima, JP;
Masami Fujimoto, Suntou-gun, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A toner comprising an external additive A, and a toner particle containing a binder resin and a colorant, wherein the external additive A: i) is an external additive that has a charge control agent on the surface thereof; ii) has a wall friction angle θ calculated from the following formula (1) of not more than 25.0°θ=τ/5.0  formula (1);iii) has a number-average particle diameter (D1) of primary particles of at least 70 nm and not more than 500 nm; and iv) has a solidity as given by the following formula (2) of at least 0.40 and not more than 0.90solidity=area of external additive/area of region encompassed by envelope for external additive   formula (2).