Patents by Inventor Tatsu Nakajima

Tatsu Nakajima 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).

  • Aluminum pipe production process, electrophotographic photosensitive member produced by the production process, and electrophotographic apparatus having the electrophotographic photosensitive member
    Patent number: 5707726
    Abstract: A process for producing an aluminum pipe is disclosed which has the steps of cutting the aluminum pipe on its periphery, and thereafter carrying out rotary pressure rolling. Also, an electrophotographic photosensitive member, a device unit, an electrophotographic apparatus and a developing roll having the aluminum pipe are disclosed.
    Type: Grant
    Filed: June 12, 1996
    Date of Patent: January 13, 1998
    Assignee: Canon Kabushiki Kaisha
    Inventors: Mutsuo Ohtaka, Hisami Tanaka, Shinichi Shibayama, Yosuke Okubo, Tatsu Nakajima
  • Electrophotographic photosensitive member produced from aluminum pipe
    Patent number: 5595848
    Abstract: A process for producing an aluminum pipe is disclosed which has the steps of cutting the aluminum pipe on its periphery, and thereafter carrying out rotary pressure rolling. Also, an electrophotographic photosensitive member, a device unit, an electrophotographic apparatus and a developing roll having the aluminum pipe are disclosed.
    Type: Grant
    Filed: February 15, 1995
    Date of Patent: January 21, 1997
    Assignee: Canon Kabushiki Kaisha
    Inventors: Mutsuo Ohtaka, Hisami Tanaka, Shinichi Shibayama, Yosuke Okubo, Tatsu Nakajima