Patents by Inventor Hanneke Boerstoel

Hanneke Boerstoel 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).

  • Cellulose solutions and products made therefrom
    Patent number: 5817801
    Abstract: An optically anisotropic solution containing cellulose and inorganic acids of phosphorus contains 94-100 wt % of the following constituents: cellulose; phosphoric acid and/or its anhydrides; and water; and 0-6 wt % of other constituents. This solution can be prepared in an apparatus in which intensive mixing is made possible by the shearing forces generated by mixers and kneaders in the apparatus. The solution can be used in making pulp, hollow fibres, staple fibre, membranes, nonwovens, or films.
    Type: Grant
    Filed: February 25, 1997
    Date of Patent: October 6, 1998
    Assignee: Akzo Nobel, NV
    Inventors: Hanneke Boerstoel, Bernardus Maria Koenders, Jan Barend Westerink
  • Process for making cellulose extrudates
    Patent number: 5804120
    Abstract: Celluloe extrudates can be made from an optically anisotropic solution containing 94-100 wt % of: cellulose; phosphoric acid and/or its anhydrides; and water by extruding the solution, coagulating the formed extrudates, and then aftertreating those extrudates so that they have a degree of acidity which at least equals 7. Fibres obtained by such a process possess particularly good thermal stability and are suitable for use as a reinforcing material.
    Type: Grant
    Filed: February 19, 1997
    Date of Patent: September 8, 1998
    Assignee: Akzo Nobel N.V.
    Inventors: Hanneke Boerstoel, Marco Ypma