Patents by Inventor Charles L. Simmons

Charles L. Simmons 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).

  • Sulfur-coated urea
    Patent number: 4676821
    Abstract: The present invention teaches a technique and provides for apparatus eminently useful for reducing the amount of sulfur currently needed by industry to coat water-soluble fertilizer materials such as, for example, granular or prilled urea. A further advantage of and benefits derived from the practice of the instant invention relates to the production of sulfur-coated urea products which have substantially higher nitrogen values than do urea products produced by prior art processes.
    Type: Grant
    Filed: December 12, 1986
    Date of Patent: June 30, 1987
    Assignee: Tennessee Valley Authority
    Inventors: Larry L. Gullett, Charles L. Simmons
  • Sulfur coating of urea containing gelling clays
    Patent number: H1085
    Abstract: The present invention teaches a technique and provides for apparatus eminently useful for reducing the amount of sulfur currently needed by industry to sulfur coat water-soluble fertilizer materials such as, for example, granular or prilled urea. A further advantage of and benefit derived from the practice of the instant invention relates to the production of sulfur-coated urea products which have substantially higher nitrogen values than do urea products produced by prior art processes.
    Type: Grant
    Filed: October 28, 1988
    Date of Patent: August 4, 1992
    Assignee: Tennessee Valley Authority
    Inventors: Charles L. Simmons, Reginald D. Cole