Patents by Inventor Gary W. Vandergrift

Gary W. Vandergrift 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).

  • Downhole mud pressure intensifier
    Patent number: 6073708
    Abstract: A mud pressure intensifier works with existing conventional drill strings without requiring special equipment or drilling fluids. The intensifier is self-contained and is located in the drill string between the drill bit and the rest of the string. The rotational power generated by a conventional mud motor is converted into reciprocal action to reciprocate a piston. The piston elevates the pressure of a portion of the mud on both the upstroke and the downstroke before discharging the pressurized mud at the drill bit.
    Type: Grant
    Filed: July 29, 1998
    Date of Patent: June 13, 2000
    Assignee: Dynamo Drilling Services Inc.
    Inventors: John F. Brown, Gary W. Vandergrift