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. 11, 2010
Filed:
May. 11, 2005
Masami Tomita, Numazu, JP;
Tomio Kondou, Numazu, JP;
Masahide Yamashita, Tokyo, JP;
Kousuke Suzuki, Numazu, JP;
Masami Tomita, Numazu, JP;
Tomio Kondou, Numazu, JP;
Masahide Yamashita, Tokyo, JP;
Kousuke Suzuki, Numazu, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A developer for an electrophotographic tandem image forming method is provided that contains a toner; and a carrier, wherein the toner has a shape factor SF-1 of from 120 to 160, an average circularity of form 0.93 to 0.98, a weight-average particle diameter (D4) of from 3.0 to 8.0 μm, and a ratio (D4/Dn) of the weight-average particle diameter (D4) to a number-average particle diameter (Dn) of from 1.01 to 1.20, and wherein the carrier is almost a spherical ferrite coated with a resin wherein alumina is dispersed, which has an average particle diameter of from 20 to 45 μm and the following formula:(MgO)x(MnO)y(FeO)zwherein x is from 1 to 5 mol %, y is from 5 to 55 mol % and z is from 45 to 55 mol %.