Patents by Inventor Norman E. Stewart

Norman E. Stewart 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).

  • Steam stimulation process for recovering heavy oil
    Patent number: 4262745
    Abstract: A method for steam stimulating a heavy oil reservoir which realizes significant energy savings is disclosed. Steam is injected into the reservoir via one well, permitted to soak and then produced back directly into the reservoir via a second well. This flowback steam production is terminated when wellhead pressures equalize, or when more than trace amounts of hydrocarbons are produced. Additional steam is injected into the reservoir via the second well, permitted to soak, and heated heavy oil is produced via both wells.
    Type: Grant
    Filed: December 14, 1979
    Date of Patent: April 21, 1981
    Assignee: Exxon Production Research Company
    Inventor: Norman E. Stewart