Patents by Inventor Tsutomu Kashikura

Tsutomu Kashikura 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).

  • Wood screw having a head with side ridges
    Patent number: 6302631
    Abstract: A wood screw that can be completely driven into a wooden plate with a small turning torque. It has a shank having a pointed tip at one end and formed with threads. A head is provided at the other end of the shank. The head is in the shape of a pyramid having ridges defining side faces therebetween. A recess for accepting a tip of a screwdriver is formed in the top face of the pyramid head.
    Type: Grant
    Filed: August 9, 2000
    Date of Patent: October 16, 2001
    Inventors: Seiichiro Takasaki, Tsutomu Kashikura
  • Screw
    Patent number: D557130
    Type: Grant
    Filed: March 14, 2005
    Date of Patent: December 11, 2007
    Assignee: Muro Corporation
    Inventors: Tsutomu Kashikura, Toshiaki Yasuda
  • Screw
    Patent number: D567075
    Type: Grant
    Filed: September 28, 2007
    Date of Patent: April 22, 2008
    Assignee: Muro Corporation
    Inventors: Tsutomu Kashikura, Toshiaki Yasuda