Patents Assigned to NGN Co., Ltd.
  • Non-return bias valve mechanism for a fluid pumping assembly
    Patent number: 6619324
    Abstract: A non-return bias valve mechanism for a fluid pumping assembly established to prevent backflow of fluid when the fluid is pumped under pressure, said mechanism comprises, a body member having a longitudinal hole 5a formed in the axis direction and radial hole(s) 5b extending from the longitudinal hole to a radial direction and going through to the outside, and, a ring shape sealing member 6 made of material having elasticity such as of rubber which is expandable that seals the radial hole(s) of the body member.
    Type: Grant
    Filed: May 15, 2001
    Date of Patent: September 16, 2003
    Assignee: NGN Co., Ltd.
    Inventors: Nagamasa Yamada, Kaoru Onizuka