Patents by Inventor Dirk Jacques Dijkstra

Dirk Jacques Dijkstra 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).

  • Polysaccharide-based thermoplastic material, process for preparing the same and method of use thereof
    Patent number: 6362330
    Abstract: The present invention relates to novel thermoplastic materials based on polysaccharide ethers which are simultaneously substituted by carboxylic acid ester groups and carbamate groups, together with mixtures of such derivatives with low molecular weight aliphatic urea derivatives.
    Type: Grant
    Filed: November 1, 1999
    Date of Patent: March 26, 2002
    Assignee: Wolff Wolsrode AG
    Inventors: Joachim Simon, Hanns-Peter Müller, Dirk Jacques Dijkstra, Gunter Weber
  • Compostable and thermoplastic cellulose ether-2-hydroxycarboxylic acid esters and mixed esters
    Patent number: 5861506
    Abstract: Thermoplastic and compostable cellulose ether esters with 2-hydroxycarboxylic acids as acid components and mixed esters which, in addition to 2-hydroxycarboxylic acid groups, have further mono-, dicarboxylic acid or carbamate groups.
    Type: Grant
    Filed: May 7, 1997
    Date of Patent: January 19, 1999
    Assignee: Wolff Walsrode AG
    Inventors: Joachim Simon, Hanns Peter Muller, Rainhard Koch, Dirk Jacques Dijkstra, Jurgen Engelhardt, Volkhard Muller
  • Thermoplastically workable, biodegradable moulding compositions
    Patent number: 5698612
    Abstract: The present invention provides thermoplastically workable and completely biodegradable moulding compositions, a process for the preparation thereof and the use thereof as biodegradable materials for the production of, for example, injection-moulded parts, films, fibres or coatings.
    Type: Grant
    Filed: December 11, 1996
    Date of Patent: December 16, 1997
    Assignee: Bayer Akteingesellschaft
    Inventors: Joachim Simon, Hanns Peter Muller, Dirk Jacques Dijkstra, Jurgen Engelhardt, Volkhard Muller, Gunter Weber