Patents by Inventor Yasuhiro Koshijima, deceased

Yasuhiro Koshijima, deceased 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 having a porous plate
    Patent number: 5166472
    Abstract: A developing device which includes a housing including an opening toward a photosensitive drum, the housing containing a single-component toner, a developing roller disposed in the opening facing the photosensitive drum so as to transfer the toner to an image-forming area between the developing roller and the photosensitive drum, a porous plate disposed in the opening and kept in contact with the part of the developing roller which is positioned in the housing, the porous plate having pores of such a size so as to allow the toner to pass through, and a toner supply means for supplying the toner from the housing to the porous plate.
    Type: Grant
    Filed: August 1, 1991
    Date of Patent: November 24, 1992
    Assignee: Mita Industrial Co., Ltd.
    Inventors: Masahiko Maeda, Yasuhiro Koshijima, deceased, Osamu Takemura