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:
Feb. 06, 2001
Filed:
Oct. 25, 1999
Noboru Kuroda, Shizuoka, JP;
Yasushi Nakamura, Shizuoka, JP;
Ryoichi Ito, Shizuoka, JP;
Yasuaki Iwamoto, Shizuoka, JP;
Kohki Katoh, Shizuoka, JP;
Tomio Kondou, Shizuoka, JP;
Kenichi Uehara, Shizuoka, JP;
Yoshihiro Sugiyama, Shizuoka, JP;
Yasuyuki Sanui, Shizuoka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A toner is made or toner particles which contains a binder resin and a coloring agent, wherein the toner particles have a weight-average particle size in a range of 6.0 to 11.5 &mgr;m, and contains toner particles (a) with a particle diameter of 5 &mgr;m or less in a content ratio of 1 to 15% by number, and toner particles (b) with a particle diameter of twice or more the weight-average particle size in a content ratio of 5 wt % or less, and the number-average particle size D25 and the number-average particle size D75 respectively obtained when the cumulative number of the toner particles reaches 25% and 75% at the measurement of a cumulative toner particle distribution by number thereof are in the relationship of 0.60≦D25/D75≦0.95. A two-component developer includes the above-mentioned toner and a carrier.