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:
Jul. 12, 2005
Filed:
Apr. 03, 2002
Hiroyuki Fushimi, Shizuoka-ken, JP;
Toshiki Nanya, Shizuoka-ken, JP;
Osamu Uchinokura, Shizuoka-ken, JP;
Shinichiro Yagi, Shizuoka-ken, JP;
Kohki Katoh, Tokyo, JP;
Hiroyuki Fushimi, Shizuoka-ken, JP;
Toshiki Nanya, Shizuoka-ken, JP;
Osamu Uchinokura, Shizuoka-ken, JP;
Shinichiro Yagi, Shizuoka-ken, JP;
Kohki Katoh, Tokyo, JP;
Ricoh Company Limited, Tokyo, JP;
Abstract
A toner including at least a binder resin; a colorant; and a charge controlling agent, in which the binder resin includes at least a polyester resin having a molecular weight distribution such that components having a molecular weight not greater than 500 are included in an amount of 4% by weight and at least a peak is present in a range of from 3,000 to 9,000 when measured by Gel Permeation Chromatography. In addition, the binder resin does not include a tetrahydrofuran-insoluble compound and the charge controlling agent is a resin charge controlling agent including at least units obtained from a monomer including a sulfonate group; an aromatic monomer including an electron absorption group; and an acrylic ester and/or a methacrylic ester monomer.