Patents by Inventor Nobuo Oyama

Nobuo Oyama 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).

  • Percussion tool utilizing negative pressure
    Patent number: 4741404
    Abstract: A percussion tool has a frame in which a percussion element is fitted such that it can move axially by a small distance and in which a hammer for hitting the percussion element is supported axially movably. The hammer is moved toward a standby position by a supply of a high pressure thereto, while forming a negative pressure acting on the hammer to force it toward a percussion position and, in the standby position, the high pressure is released to allow the hammer to move toward the percussion position by the negative pressure.
    Type: Grant
    Filed: September 4, 1985
    Date of Patent: May 3, 1988
    Assignee: Landmark West Ltd.
    Inventor: Nobuo Oyama