Patents Assigned to Railhead Underground Products, L.L.C.
  • Sonde housing door hold-down system
    Patent number: 5934391
    Abstract: A sonde housing for horizontal directional drilling includes a cylindrical housing body with walls defining a longitudinal cavity, a cover for the cavity, and a hold-down means for attaching the cover to the housing body.
    Type: Grant
    Filed: November 12, 1997
    Date of Patent: August 10, 1999
    Assignee: Railhead Underground Products, L.L.C.
    Inventor: David M. Cox
  • Drill bit for horizontal directional drilling of rock formations
    Patent number: 5899283
    Abstract: A drill bit for directional boring of all earth formations such as dirt, sand, rock and/or any type combination of formations, utilizing a bit body containing fixed and semi-floating cutting points and one or more fluid channels for the purpose of lubricating and dispersing cut and/or fractured formations.
    Type: Grant
    Filed: November 12, 1997
    Date of Patent: May 4, 1999
    Assignee: Railhead Underground Products, L.L.C.
    Inventor: David M. Cox