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:
Jul. 31, 2012
Filed:
Sep. 03, 2008
Tohru Moriya, Shizuoka, JP;
Hitoshi Onoda, Shizuoka, JP;
Kazuyoshi Hattori, Shizuoka, JP;
Yoshihito Suwa, Shizuoka, JP;
Tohru Moriya, Shizuoka, JP;
Hitoshi Onoda, Shizuoka, JP;
Kazuyoshi Hattori, Shizuoka, JP;
Yoshihito Suwa, Shizuoka, JP;
Tomoegawa Co., Ltd., Tokyo, JP;
Abstract
A toner for electrophotography includes toner particles containing at least a binder resin and a colorant, to which strontium titanate and hydrophobic silica as external additives are admixed, wherein the strontium titanate has a BET specific surface area of 20-50 m/g and contains particles in a rectangular parallelepiped shape and wherein the hydrophobic silica contains hydrophobic silica A that has at least a BET specific surface area of 150-300 m/g and the surface of which has been treated with an aminosilane and hexamethyldisilazane and hydrophobic silica B that has at least a BET specific surface area of 90-150 m/g and the surface of which has been treated with hexamethyldisilazane.