Patents by Inventor Benjamin H. Fuchs

Benjamin H. Fuchs 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).

  • Underreamer with cylindrical boss and socket hinge assembly for the cutter arm
    Patent number: 4461361
    Abstract: An underreamer having a plurality of drilling arms hingedly attached to a tubular body for movement between a retracted position and an extended position for drilling. The hinge attachment includes a cylindrical boss and socket assembly, between the arm and a removeable hinge plate retained in a recess in the body against outward movement by an engaging key and keyway between the plate and wall of the recess.
    Type: Grant
    Filed: December 7, 1981
    Date of Patent: July 24, 1984
    Assignee: Dresser Industries, Inc.
    Inventor: Benjamin H. Fuchs
  • Underreamer with debris flushing flow path
    Patent number: 4401171
    Abstract: An underreamer having a plurality of drilling arms hingedly attached to a tubular body for movement between a retracted position and an extended position for drilling. The underreamer includes a central wash pipe for delivering drilling mud to remove cuttings and debris from the hole during drilling and an alternate flow path, generally through the body for delivering drilling fluid to the vicinity between the arm and the body to flush debris therefrom which would prevent the arms from retracting to their normal position for withdrawal from the borehole.
    Type: Grant
    Filed: December 10, 1981
    Date of Patent: August 30, 1983
    Assignee: Dresser Industries, Inc.
    Inventor: Benjamin H. Fuchs