Patents Examined by Jack Kreck
  • Method and means for processing oil sands while excavating
    Patent number: 7461901
    Abstract: The present invention is directed to the separation of bitumen, such as by the Clark process or by a countercurrent de-sander, in an underground excavation machine, such as a tunnel boring machine.
    Type: Grant
    Filed: November 9, 2006
    Date of Patent: December 9, 2008
    Assignee: OSUM Oil Sands Corp.
    Inventors: Ronald D. Drake, Michael Helmut Kobler, John David Watson