Patents by Inventor Tadashi Harayama

Tadashi Harayama has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • FERRITE PARTICLES AND PRODUCTION METHOD THEREOF
    Publication number: 20090246526
    Abstract: A method for producing ferrite particles by weighing, mixing, then crushing ferrite raw materials, and granulating the resultant slurry, and then sintering the resultant granulated material using a rotary furnace, wherein the sintering is carried out under a positive pressure reducing atmosphere.
    Type: Application
    Filed: March 25, 2009
    Publication date: October 1, 2009
    Applicant: Powdertech Co., Ltd.
    Inventors: Takao SUGIURA, Takashi HIKICHI, Yoshinori KUSAKA, Satoru TANIGUCHI, Tadashi HARAYAMA, Hiromichi KOBAYASHI
  • Ferrite carrier for electrophotographic developer and method for preparing the same, and electrophotographic developer using the same
    Patent number: 7442483
    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.
    Type: Grant
    Filed: June 28, 2005
    Date of Patent: October 28, 2008
    Assignee: Powdertech Co., Ltd.
    Inventors: Hiromichi Kobayashi, Kanao Kayamoto, Tadashi Harayama, Issei Shinmura, Toshio Honjo
  • Ferrite carrier for electrophotographic developer and method for preparing the same, and electrophotographic developer using the same
    Publication number: 20060003248
    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.
    Type: Application
    Filed: June 28, 2005
    Publication date: January 5, 2006
    Applicant: POWDERTECH CO., LTD.
    Inventors: Hiromichi Kobayashi, Kanao Kayamoto, Tadashi Harayama, Issei Shinmura, Toshio Honjo