Patents by Inventor Shizuo Matsumura

Shizuo Matsumura 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).

  • Leakage measuring device
    Patent number: 6321590
    Abstract: The present invention provides a leakage measuring device capable of measuring the leakage always accurately.
    Type: Grant
    Filed: July 19, 1999
    Date of Patent: November 27, 2001
    Assignee: Kayaba Industry Co., Ltd.
    Inventor: Shizuo Matsumura
  • Pressure control valve
    Patent number: 4351356
    Abstract: A pilot poppet (44) is unseated when a pressure in a back pressure chamber (39) exceeds a spring (47) preload force to communicate the back pressure chamber (39) with a relief port (33). The pressure in a pressure port (32) is communicated to the back pressure chamber (39) through a radial clearance between a piston poppet (61) which extends through a relief poppet (31) and the relief poppet (31). A spring (62) maintains the piston poppet (61) engaged with the pilot poppet (44). Alternatively, the piston poppet and pilot poppet may be integral (66). The relief poppet (31) is unseated by a pressure difference between the back pressure chamber (39) and the pressure port (32) to communicate the pressure port (32) with the relief port (33) since communication of the back pressure chamber (39) with the relief port (33) causes the pressure in the back pressure chamber (39) to drop. The relief poppet (31 ) seats when the pressure in the pressure port (32) drops below the pressure in the back pressure chamber (39).
    Type: Grant
    Filed: June 26, 1980
    Date of Patent: September 28, 1982
    Assignee: Kayaba Kogyo Kabushiki Kaisha
    Inventors: Hideshi Koiwai, Shizuo Matsumura, Haruhiko Kawasaki
  • Pressure control valve
    Patent number: 4289160
    Abstract: A pilot poppet (44) is unseated when a pressure in a back pressure chamber (39) exceeds a spring (47) preload force to communicate the back pressure chamber (39) with a relief port (33). The pressure in a pressure port (32) is communicated to the back pressure chamber (39) through a tubular piston poppet (37) which extends through a relief poppet (31). The relief poppet (31) is unseated by a pressure difference between the back pressure chamber (39) and the pressure port (32) to communicate the pressure port (32) with the relief port (33) since communication of the back pressure chamber (39) with the relief port (33) causes the pressure in the back pressure chamber (39) to drop. The piston poppet (37) is moved to engage the pilot poppet (44) and block communication between the pressure port (32) and the back pressure chamber (39), thereby causing the pressure in the back pressure chamber (39) to drop further.
    Type: Grant
    Filed: February 14, 1980
    Date of Patent: September 15, 1981
    Assignee: Kayaba Kogyo Kabushiki Kaisha
    Inventors: Haruhiko Kawasaki, Hideshi Koiwai, Shizuo Matsumura