Patents by Inventor Andre F. Kayaert

Andre F. Kayaert 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).

  • Process for producing fertilizer granules
    Patent number: 5120345
    Abstract: A process for producing fertilizer granules containing urea and ammonium sulphate by granulation in a fluidized bed of particles is described. Ammonium sulphate particles are introduced into a fluidized bed and urea is applied to the particles in the fluidized bed by spraying an aqueous urea-containing liquid with a urea concentration of 70-99.9% by weight. Preferably, the aqueous urea solution contains a granulation additive and/or ammonium sulphate.
    Type: Grant
    Filed: December 11, 1990
    Date of Patent: June 9, 1992
    Assignee: Nederlandse Stikstof Maatschappij B.V.
    Inventors: Andre F. Kayaert, Walter Cardon