Patents by Inventor Yasunobu Roppongi

Yasunobu Roppongi 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).

  • Roll type solid electrolyte capacitor
    Patent number: 4889536
    Abstract: Disclosed is a solid electrolytic capacitor having a roll-form capacitor element. The capacitor element has a coated structure comprising a valve metal positive electrode substrate having a dielectric oxide layer on the surface thereof, a semiconductor layer formed on the dielectric oxide layer and an electroconductive layer formed on the semiconductor layer.
    Type: Grant
    Filed: June 27, 1989
    Date of Patent: December 26, 1989
    Assignees: Showa Denko Kabushiki Kaisha, Nippon Chemi-Con Corporation
    Inventors: Kazumi Naitoh, Yoshiaki Arakawa, Takashi Ikezaki, Shoji Yabe, Yutaka Yokoyama, Yuichi Hamaguchi, Yasunobu Roppongi, Yuichi Hamaguchi