Patents by Inventor Robert D. Humphries

Robert D. Humphries 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 producing dry granular fertilizer and soil amendments using clay slurry and dry chemicals
    Patent number: 5749936
    Abstract: An improved continuous process for producing granular fertilizer and/or soil amendments resulting in a high quality granular product. A slurry of clay in water with a dispersant is prepared using intensive mixing. Dry components are intimately mixed with the slurry in a mixer. The mixture is fed into a granulator to produce granules within a desired range of granule sizes. The granules are dried in a dryer and screened to remove any granules of an undesired size. The undesired granules are recycled.
    Type: Grant
    Filed: June 7, 1996
    Date of Patent: May 12, 1998
    Assignee: A.J. Sackett and Sons Company
    Inventors: Robert D. Humphries, Delbert R. Dreese, Louis L. Taylor, Dennis Clay Parker