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:
May. 15, 2007
Filed:
Mar. 16, 2004
Kumi Hasegawa, Shizuoka, JP;
Mitsuo Aoki, Shizuoka, JP;
Bing Shu, Shizuoka, JP;
Toyoshi Sawada, Kanagawa, JP;
Keiko Shiraishi, Shizuoka, JP;
Masashi Nagayama, Shizuoka, JP;
Shinichi Kuramoto, Shizuoka, JP;
Kumi Hasegawa, Shizuoka, JP;
Mitsuo Aoki, Shizuoka, JP;
Bing Shu, Shizuoka, JP;
Toyoshi Sawada, Kanagawa, JP;
Keiko Shiraishi, Shizuoka, JP;
Masashi Nagayama, Shizuoka, JP;
Shinichi Kuramoto, Shizuoka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A toner for electrophotography contains a binder resin, a charge control agent, and a colorant. The colorant is a black iron oxide compound containing 10 to 45% by weight of titanium component calculated in terms of Ti atom in relation to Fe atom when measured by wavelength dispersive X-ray fluorescence spectrometry. Peaks at Bragg angle 2θ of the toner to CuKα X-ray are peak A at 32.9 degrees ±0.3 degrees and peak B at 35.5 degrees ±0.3 degrees, and X ray intensity ratio between peaks A and B (A/B) is in the range of 0.3 to 2.0 at a scan speed of 0.5 to 4 degrees/min.