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. 28, 2008
Filed:
Jun. 28, 2005
Hiromichi Kobayashi, Kashiwa, JP;
Kanao Kayamoto, Kashiwa, JP;
Tadashi Harayama, Kashiwa, JP;
Issei Shinmura, Kashiwa, JP;
Toshio Honjo, Kashiwa, JP;
Hiromichi Kobayashi, Kashiwa, JP;
Kanao Kayamoto, Kashiwa, JP;
Tadashi Harayama, Kashiwa, JP;
Issei Shinmura, Kashiwa, JP;
Toshio Honjo, Kashiwa, JP;
Powdertech Co., Ltd., Chiba, JP;
Abstract
A ferrite carrier for the electrophotographic developer containing 40 to 500 ppm of zirconium; a method for preparing a ferrite carrier for the electrophotographic developer, comprising the steps for weighing, mixing, and pulverizing ferrite raw materials, and for granulating, drying, and firing the obtained slurry; wherein a zirconium raw material is added so that the zirconium content after firing becomes 40 to 500 ppm; and an electrophotographic developer using the ferrite carrier.