Patents by Inventor Richard A. Kelch

Richard A. Kelch 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).

  • Encapsulated slow release fertilizers
    Patent number: 5186732
    Abstract: A coated product comprising a water soluble core material having a water insoluble polymeric coating encapsulating said core and a process for the production thereof. The encapsulating coating comprising a water-borne, polyvinylidene chloride-based latex composition which provides for the release of the water soluble core material over an extended period of time.
    Type: Grant
    Filed: November 12, 1991
    Date of Patent: February 16, 1993
    Assignee: The O. M. Scott & Sons Company
    Inventors: Harold E. Thompson, Richard A. Kelch
  • Encapsulated slow release fertilizers
    Patent number: 5089041
    Abstract: A coated product comprising a water soluble core material having a water insoluble polymeric coating encapsulating said core and a process for the production thereof. The encapsulating coating comprising a water-borne, polyvinylidene chloride-based latex composition which provides for the release of the water soluble core material over an extended period of time.
    Type: Grant
    Filed: March 22, 1990
    Date of Patent: February 18, 1992
    Assignee: The O.M. Scott & Sons Company
    Inventors: Harold E. Thompson, Richard A. Kelch