Patents by Inventor David S. Dillard, Jr.

David S. Dillard, Jr. 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 of solution mining potassium chloride from subterranean deposits
    Patent number: 3994531
    Abstract: The present invention relates to an improved method of solution mining potassium chloride from subterranean ore deposits containing both potassium chloride and sodium chloride. By the present invention, an aqueous medium is passed through the ore deposits so that potassium chloride and sodium chloride are dissolved therein. Magnesium chloride is combined with the aqueous brine solution formed so that an aqueous brine solution containing potassium chloride, sodium chloride and magnesium chloride in specific proportions is produced, and the solubility of potassium chloride in the solution is reduced. The combined aqueous brine solution is then concentrated so that it is substantially saturated with potassium chloride, and the concentrated solution is cooled to cause the precipitation of substantially pure potassium chloride.
    Type: Grant
    Filed: September 3, 1971
    Date of Patent: November 30, 1976
    Assignee: Continental Oil Company
    Inventors: David S. Dillard, Jr., J. Gilbert Davis, II, Richard L. Every