Patents Assigned to Tround International, Inc.
  • Directional drilling
    Patent number: 4582147
    Abstract: A system for directional drilling of boreholes into the earth under control of the driller at the surface, employing a rotating earth drill including a projectile firing mechanism, that is timed to nonsymmetrically fire projectiles into the earth at controlled angular positions that are offset from the axis of the drill and drill string in the desired direction of drilling.
    Type: Grant
    Filed: July 16, 1982
    Date of Patent: April 15, 1986
    Assignee: Tround International, Inc.
    Inventor: David Dardick