Patents by Inventor Yutaka Hukase

Yutaka Hukase 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
    Patent number: 4669553
    Abstract: A percussion tool utilizing a reciprocatory piston movement for applying an impact force on to a working surface including a casing (1) having disposed axially therein a hammer member (12), an anvil (5) impacted by the hammer member and a chisel point (4) supported by the anvil. A spool valve (18) is located within the interior of the hammer member for reciprocatory movement in unison with the hammer member, the control the flow of a pressurized working fluid supplied to the hammer member, to thereby cyclically move the hammer member in reciprocatory movement.
    Type: Grant
    Filed: January 11, 1985
    Date of Patent: June 2, 1987
    Inventor: Yutaka Hukase