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:
Oct. 18, 2011
Filed:
Mar. 05, 2009
Masahiro Anno, Tokyo, JP;
Masahiko Nakamura, Tokyo, JP;
Tsuyoshi Uchida, Tokyo, JP;
Kenichi Onaka, Tokyo, JP;
Junya Onishi, Tokyo, JP;
Naoya Tonegawa, Tokyo, JP;
Masahiro Anno, Tokyo, JP;
Masahiko Nakamura, Tokyo, JP;
Tsuyoshi Uchida, Tokyo, JP;
Kenichi Onaka, Tokyo, JP;
Junya Onishi, Tokyo, JP;
Naoya Tonegawa, Tokyo, JP;
Konica Minolta Business Technologies, Inc., Tokyo, JP;
Abstract
Provided is a two-component developer with which degradation of development is inhibited even in the case of prolonged use, and thereby a high quality image exhibiting high resolution and sufficient image density can be formed for a long duration. Also disclosed is a two-component developer possessing a carrier and a toner, wherein the carrier in which magnetic material powder is dispersed in a binder resin containing a phenol formaldehyde resin has a shape coefficient SF-1 of 1.0-1.2, a shape coefficient SF-2 of 1.1-2.5 and a volume-based median particle diameter of 10-100 μm, and the toner possesses a colored particle and an external additive particle, wherein the external additive particle comprises a titanic acid compound and iron, and the iron content is 100-1,000 ppm, based on the titanic acid compound.