Patents Examined by Caldarola Glenn
  • Method for treating shale
    Patent number: 4668380
    Abstract: A method for producing a kerogen concentrate from oil shale comprises treating shale with an aqueous caustic treating solution to produce a shale product of substantially transformed mineral content, and then treating the shale product with an aqueous acid solution to produce a kerogen concentrate. The acid solution extracts minerals from the shale product to lower the ash content of the kerogen concentrate. A spent acid solution containing the extracted minerals can be treated to recover minerals therefrom.
    Type: Grant
    Filed: October 13, 1983
    Date of Patent: May 26, 1987
    Assignee: Standard Oil Company (Indiana)
    Inventors: William F. Wolff, John D. McCollum