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:
Jan. 15, 2008
Filed:
Aug. 03, 2006
Akihiro Kotsugai, Numazu, JP;
Satoshi Mochizuki, Numazu, JP;
Hisashi Nakajima, Numazu, JP;
Yasuo Asahina, Numazu, JP;
Osamu Uchinokura, Numazu, JP;
Masayuki Ishii, Numazu, JP;
Tomoyuki Ichikawa, Kawasaki, JP;
Shinya Nakayama, Numazu, JP;
Koichi Sakata, Numazu, JP;
Tomoko Utsumi, Ebina, JP;
Hitoshi Iwatsuki, Numazu, JP;
Yasuaki Iwamoto, Numazu, JP;
Hideki Sugiura, Fuji, JP;
Masami Tomita, Numazu, JP;
Akihiro Kotsugai, Numazu, JP;
Satoshi Mochizuki, Numazu, JP;
Hisashi Nakajima, Numazu, JP;
Yasuo Asahina, Numazu, JP;
Osamu Uchinokura, Numazu, JP;
Masayuki Ishii, Numazu, JP;
Tomoyuki Ichikawa, Kawasaki, JP;
Shinya Nakayama, Numazu, JP;
Koichi Sakata, Numazu, JP;
Tomoko Utsumi, Ebina, JP;
Hitoshi Iwatsuki, Numazu, JP;
Yasuaki Iwamoto, Numazu, JP;
Hideki Sugiura, Fuji, JP;
Masami Tomita, Numazu, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
To provide a toner that can provide long-term removability and high-definition images with reduced image layer thickness and densely-packed toner particles, a developer capable of forming high-quality images using the toner, a toner container for containing the toner, a process cartridge using the toner, an image forming apparatus using the toner, and an image forming method using the toner. The toner of the present invention is a toner having a substantially spherical shape with irregularities on its surface and containing at least a binder resin and a colorant, wherein a surface factor SF-that represents the sphericity of toner particles is 105 to 180, a surface factor SF-that represents the degree of surface irregularities of the toner particles is correlated with the volume-average diameter of the toner particles, and the toner particles have an inorganic oxide particle-containing layer within 1 μm from their surfaces.