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:
Jun. 30, 2009
Filed:
Feb. 06, 2004
Hiromichi Kobayashi, Kashiwa, JP;
Issei Shinmura, Kashiwa, JP;
Tsuyoshi Itagoshi, Kashiwa, JP;
Yuji Sato, Kashiwa, JP;
Hiromichi Kobayashi, Kashiwa, JP;
Issei Shinmura, Kashiwa, JP;
Tsuyoshi Itagoshi, Kashiwa, JP;
Yuji Sato, Kashiwa, JP;
Powdertech Co., Ltd., Chiba, JP;
Abstract
A carrier core material containing at least one metal oxide (MO) having a melting point of not higher than 1000° C. and at least one metal oxide (MO) having a melting point of not lower than 1800° C., wherein the metal (M) for constituting the metal oxide (MO) has an electrical resistivity of not less than 10Ω·cm. Also disclosed is a two-component developing agent comprising a coated carrier, which comprises the carrier core material coated with a resin, and toner particles. Further disclosed is an image forming method comprising developing an electrostatic latent image formed on a photosensitive member with the two-component developing agent using an alternating electric field. The carrier core material and the coated carrier have high magnetization and are free from occurrence of leakage of electric charge over a wide range of electric field from low electric field to high electric field. According to the two-component developing agent, an excellent image can be formed.