Patents by Inventor Keijyu Yamada

Keijyu Yamada 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).

  • Dowel pin setting instrument
    Patent number: 4229167
    Abstract: A dowel pin setting instrument provided with a supporting means having a first member and a second member detachably inserted into the first member so as to prevent its rotation therein and mounted on an impression material other than a tooth mark and a flexible tube having dowel pin fitted at one end thereto and coupled at the other end to supporting means.
    Type: Grant
    Filed: June 30, 1978
    Date of Patent: October 21, 1980
    Assignee: Porceny Co., Ltd.
    Inventors: Makoto Kikuchi, Keijyu Yamada