Patents by Inventor John van der Hoeven

John van der Hoeven 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 improving the crushing strength, impact resistance and compressibility of urea, and urea composition
    Patent number: 8084642
    Abstract: A method of improving the crushing strength, impact resistance and the compressibility of urea granules by the addition of a compound to the molten urea, wherein the compound comprises both a polyvinyl compound and an organic molecule consisting of 1-10 carbon atoms and 1-10 polar organic groups.
    Type: Grant
    Filed: October 6, 2003
    Date of Patent: December 27, 2011
    Assignee: Yara International ASA
    Inventors: Erik Bijpost, Luc Vanmarcke, John van der Hoeven, Ruud van Belzen
  • Urea composition having reduced compressibility, cake formation and dust formation, and process for its preparation
    Patent number: 7824565
    Abstract: Colorfast urea composition having reduced compressibility, cake formation and tendency of re-crystallization of the urea granulate, wherein the granulate further contains at least two different biodegradable polymers, of which at least one polymer is preferably a polyalkenyl amine compound. The other polymer is preferably polyaspartic acid or polyvinyl alcohol. The invention further relates to a process for the preparation of such a urea composition.
    Type: Grant
    Filed: January 16, 2006
    Date of Patent: November 2, 2010
    Assignee: Yara International ASA
    Inventors: Ruud van Belzen, Luc Vanmarcke, Erik Bijpost, John van der Hoeven
  • Urea Composition Having Reduced Compressibility, Cake Formation and Dust Formation, and Process for Its Preparation
    Publication number: 20080190161
    Abstract: Colourfast urea composition having reduced compressibility, cake formation and tendency of re-crystallization of the urea granulate, wherein the granulate further contains at least two different biodegradable polymers, of which at least one polymer is preferably a polyalkenyl amine compound. The other polymer is preferably polyaspartic acid or polyvinyl alcohol. The invention further relates to a process for the preparation of such a urea composition.
    Type: Application
    Filed: January 16, 2006
    Publication date: August 14, 2008
    Inventors: Ruud van Belzen, Luc Vanmarcke, Erik Bijpost, John Van Der Hoeven
  • Method of improving the crushing strength, impact resistance and compressibility of urea, and urea composition
    Publication number: 20070131011
    Abstract: A method of improving the crushing strength, impact resistance and the compressibility of urea granules by the addition of a compound to the molten urea, wherein the compound comprises both a polyvinyl compound and an organic molecule consisting of 1-10 carbon atoms and 1-10 polar organic groups.
    Type: Application
    Filed: October 6, 2003
    Publication date: June 14, 2007
    Applicant: YARA INTERNATIONAL ASA
    Inventors: Erik Bijpost, Luc Vanmarcke, John Van Belzen, John Van Der Hoeven