Patents by Inventor Ritsurou Makita

Ritsurou Makita 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).

  • Electrode plate for plasma etching
    Patent number: 5324411
    Abstract: A disc-shaped electrode plate body is made of high-purity glassy carbon and has a large number of very-small-diameter through holes each of which has a plurality of spherical recesses in its internal wall surface.
    Type: Grant
    Filed: September 18, 1992
    Date of Patent: June 28, 1994
    Assignee: Toshiba Ceramics Co., Ltd.
    Inventors: Masahiko Ichishima, Yasumi Sasaki, Eiichi Toya, Masatoshi Kasahara, Ritsurou Makita