Patents by Inventor Mithuo Yamashita

Mithuo Yamashita 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).

  • Keyboard
    Patent number: 4840104
    Abstract: A keyboard for a musical instrument is composed of a resin composition, having a durometer hardness of 82 or larger, and the composition comprises a cellulose derivative resin and a silica having 3.0 or less silanol groups in the area of 100 square angstrom and a BET specific surface area of 10 to 210 m.sup.2 /g. It may comprises a substrate and the keyboard.
    Type: Grant
    Filed: February 5, 1988
    Date of Patent: June 20, 1989
    Assignee: Kawai Musical Instrument Manufacturing Co., Ltd.
    Inventors: Muneo Ishida, Mithuo Yamashita, Masanari Onishi, Masahiro Tanaka