Patents by Inventor Paul J. Jespersen

Paul J. Jespersen 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).

  • Multiple drain method for recovering oil from tar sand
    Patent number: 6263965
    Abstract: A thermal method is described for recovering normally immobile hydrocarbon oil from a subsurface tar sand deposit.
    Type: Grant
    Filed: April 13, 1999
    Date of Patent: July 24, 2001
    Assignee: Tecmark International
    Inventors: Brian H. Schmidt, Paul J. Jespersen, Brian J. Kristoff