Patents by Inventor Donald Tolfree

Donald Tolfree 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).

  • DUAL UNDERGROUND TUNNEL SYSTEM FOR HYDROCARBON EXPLOITATION
    Publication number: 20140262219
    Abstract: A system for recovering hydrocarbons from a subterranean formation includes an upper tunnel extending through the formation. In addition, the system includes a lower tunnel extending through the formation below a portion of the upper tunnel. Further, the system includes a plurality of conduits extending from the upper tunnel through the formation to the lower tunnel. Still further, the system includes a plurality of wellbores extending from the lower tunnel into a hydrocarbon-bearing portion of the formation.
    Type: Application
    Filed: March 13, 2014
    Publication date: September 18, 2014
    Inventors: Richard Beddoes, Ulric Fournier, Mark O. Johnson, Joseph Kirchner, Thomas Krzewinski, William Thompson, Donald Tolfree, Christopher C. West