Patents by Inventor William Lavender

William Lavender 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).

  • Process for secondary recovery of bitumen in hot water extraction of tar sand
    Patent number: 4172025
    Abstract: It has been found that tank-type air flotation cells are more efficient, when treating hot water process middlings containing in excess of about 3% bitumen, than trough-type air flotation cells. Also, it has been found that the trough-type cells are more efficient than the tank-type cells when treating middlings containing less than about 3% bitumen. Thus a secondary recovery circuit is proposed wherein the middlings are first treated in one or more tank-type cells in series and the underflow from the last tank-type cell is treated in one or more banks of trough-type cells.
    Type: Grant
    Filed: May 11, 1978
    Date of Patent: October 23, 1979
    Assignees: Petro-Canada Exploration Inc., Her Majesty the Queen in right of the Province of Alberta, Government of the Province of Alberta, Department of Energy and Natural Resources, Alberta Syncrude Equity, Ontario Energy Corporation, Imperial Oil Limited, Canada-Cities Service, Ltd., Gulf Oil Canada Limited
    Inventors: Kenneth Porteous, William Lavender