Patents by Inventor Adley W. Hemphill

Adley W. Hemphill 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).

  • Method for solution mining of complex carbonaceous materials
    Patent number: 4368922
    Abstract: Underground coal is mined by sinking a hole into the coal, passing a coal solvent to the coal, and recovering a coal solution and/or dispersion products from the resulting solution or suspension.
    Type: Grant
    Filed: December 2, 1980
    Date of Patent: January 18, 1983
    Assignee: W. R. Grace & Co.
    Inventors: Adley W. Hemphill, Joseph T. Lundquist, Jr., Carl V. McDaniel