Patents by Inventor Harry Elwood Simpson

Harry Elwood Simpson 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).

  • Apparatus for borehole drilling
    Patent number: 3952799
    Abstract: Apparatus is disclosed for borehole drilling which provides a pressure-tight seal between the drill pipe and the borehole or casing. The apparatus uses resilient elements between the borehole and the body portion of the drilling head. The resilient elements may be engaged in sealing engagement in the borehole by hydraulic or air inflation.
    Type: Grant
    Filed: October 24, 1974
    Date of Patent: April 27, 1976
    Assignee: Dresser Industries, Inc.
    Inventor: Harry Elwood Simpson