Patents by Inventor Shinju Nagatsuna

Shinju Nagatsuna 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).

  • Image forming apparatus having a separate black developer stored for a color image
    Patent number: 5160969
    Abstract: An image forming apparatus has a plurality of developing containers for developing an electrostatic latent image of a latent image carrier by toners having colors different from each other except for black; a black developing container for color for storing black toner for color and operated when the developed image on the latent image carrier every color is overlapped and transferred onto a transfer material to provide a color image; a black developing container for a monochromatic image for storing black toner for a monochromatic image and operated when the monochromatic image is obtained; and a device for arranging the respective developing containers such that the developing containers are opposite to the latent image carrier. The other image forming apparatuses are also shown.
    Type: Grant
    Filed: May 29, 1991
    Date of Patent: November 3, 1992
    Assignee: Ricoh Company, Ltd.
    Inventors: Kenichi Mizuma, Hideya Furuta, Nobuo Kasahara, Noriyuki Kimura, Shinju Nagatsuna, Mitsuru Mamizuka, Yoshihiro Sakai, Kazunori Bannai, Kazushige Taguchi, Yasunori Kawaishi, Makoto Ohsaki, Tatsuo Hirono