Patents by Inventor Kyota Koetsuka

Kyota Koetsuka 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).

  • Developing device using a developing roller and image forming apparatus including the same
    Patent number: 6697593
    Abstract: A developing roller of the present invention is made up of a nonmagnetic sleeve and a magnet roller disposed in the sleeve. The magnet roller includes a cylindrical magnet produced by molding a mixture of magnetic powder and a high polymer, and a single rare-earth magnet block mounted on the magnet at a position corresponding to a main magnetic pole for development. The cylindrical magnet is magnetized such that magnetic poles adjoining the main magnetic pole are opposite in polarity to the main pole. The main pole and each pole adjoining it make an angle of 45° or less therebetween.
    Type: Grant
    Filed: February 21, 2002
    Date of Patent: February 24, 2004
    Assignee: Ricoh Company, Ltd.
    Inventors: Tsuyoshi Imamura, Sumio Kamoi, Kyota Koetsuka, Noriyuki Kamiya, Mieko Kakegawa, Toshihiro Atsumi
  • Developing device using a developing roller and image forming apparatus including the same
    Publication number: 20020114647
    Abstract: A developing roller of the present invention is made up of a nonmagnetic sleeve and a magnet roller disposed in the sleeve. The magnet roller includes a cylindrical magnet produced by molding a mixture of magnetic powder and a high polymer, and a single rare-earth magnet block mounted on the magnet at a position corresponding to a main magnetic pole for development. The cylindrical magnet is magnetized such that magnetic poles adjoining the main magnetic pole are opposite in polarity to the main pole. The main pole and each pole adjoining it make an angle of 45° or less therebetween.
    Type: Application
    Filed: February 21, 2002
    Publication date: August 22, 2002
    Inventors: Tsuyoshi Imamura, Sumio Kamoi, Kyota Koetsuka, Noriyuki Kamiya, Mieko Kakegawa, Toshihiro Atsumi