Patents by Inventor Walter E. Cardon

Walter E. Cardon 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 fertilizer granules containing urea and ammonium sulphate
    Patent number: 4943308
    Abstract: The invention concerns a method of producing fertilizer granules containing urea and ammonium sulphate by granulating a mixture containing urea, ammonium sulphate and water, which is characterized in that the ammonium sulphate is completely dissolved in an aqueous urea solution with a urea concentration of 70-85% by weight, the resulting solution is thickened to a dry content of 92-97% by weight, with a granulation additive for the urea being added in any stage of the treatment, following which the thickened solution is granulated in a fluidized bed of urea and ammonium sulphate containing nuclei.
    Type: Grant
    Filed: December 28, 1988
    Date of Patent: July 24, 1990
    Assignee: Hydro Agri Sluiskil B.V.
    Inventors: Luc A. Vanmarcke, Walter E. Cardon