Patents Assigned to Nishiyama Gomu Kabushiki Kaisha
  • Device for sealing the end of sheath pipe
    Patent number: 3964754
    Abstract: Device for sealing the end of a sheath pipe that protects a main pipe therein, comprising a pair of sealing rings arranged in face-to-face relation, a pair of flanges oppositely placed at the outside of said sealing rings, all these sealing rings and flanges being tightened with bolts into a unit, each sealing ring being made of flexibly elastic material having a cup shape cross section.
    Type: Grant
    Filed: May 19, 1975
    Date of Patent: June 22, 1976
    Assignee: Nishiyama Gomu Kabushiki Kaisha
    Inventors: Masayo Murai, Hiroki Monno