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:
Jun. 15, 1993
Filed:
Mar. 08, 1991
Applicant:
Inventors:
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03G / ;
U.S. Cl.
CPC ...
430110 ; 430109 ; 430904 ;
Abstract
A toner for developing an electrostatic image, comprising color resin particles and a particulate additive. The color resin particles contain at least a coloring agent and a binding resin. The color resin particles possess irregular surfaces but not breaks, and the irregularity may be formed by depositing and fixing onto the surface fine resin particles having an average particle size in a range of 1/200 to 1/10 of the color resin particle size. A particulate additive has an average particles size of not more than 1/10 of volume average particle size of the color resin particles. The BET specific surface area of the toner changes by 20% or less before and after the forced stirring of the toner.