Patents by Inventor Harold L. Erskine

Harold L. Erskine 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).

  • Recovering bitumen from large water surfaces
    Patent number: 3933651
    Abstract: The specification discloses an apparatus for recovering bitumen from large water surfaces. The apparatus comprises a crowned continuous conveyor belt with screen-bottomed scoops spaced along the outer surface of the belt.
    Type: Grant
    Filed: October 7, 1974
    Date of Patent: January 20, 1976
    Assignee: Great Canadian Oil Sands Limited
    Inventor: Harold L. Erskine