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. 14, 1999
Filed:
Dec. 19, 1997
Yuka Ishihara, Minami-Ashigara-shi, JP;
Masanori Ichimura, Minami-Ashigara-shi, JP;
Takashi Imai, Minami-Ashigara-shi, JP;
Hiroshi Takano, Minami-Ashigara-shi, JP;
Hiroshi Nakazawa, Minami-Ashigara-shi, JP;
Yoshifumi Iida, Minami-Ashigara-shi, JP;
Susumu Yoshino, Minami-Ashigara-shi, JP;
Fuji Xerox Co., Ltd., Tokyo, JP;
Abstract
The present invention provides an electrostatic image developer comprising a toner and a carrier wherein the toner includes toner particles having an average particle diameter of 3 to 9 .mu.m, a hydrophobic silica microparticles having a BET specific surface area of 40 to 120 m.sup.2 /g, and a hydrophobic titanium compound microparticles having a BET specific surface area of 40 to 250 m.sup.2 /g; and wherein the carrier is a resin coated carrier having a coating layer of a resin. The electrostatic image developer can improve the environmental dependency of charging, power fluidity, resistance to caking of a toner and reduced change in charging with time course to provide an image with an excellent image quality for a long period of time.