Patents by Inventor Leonardus Jacobus Johannes Wilhelmus Welzen

Leonardus Jacobus Johannes Wilhelmus Welzen 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 for the manufacturing of a low shrinkage flexible sheet
    Patent number: 9522518
    Abstract: The invention relates to a method for the manufacturing of a low shrinkage flexible sheet, said sheet comprising a fabric containing polyolefin fibers, said method comprising the steps of: a) depositing a molten plastomer layer on at least one surface of the woven fabric to form a sheet having a thickness approximately equal with the sum of the thicknesses of said molten plastomer layer and of said fabric; and b) impregnating said fabric with at least part of the molten plastomer layer by drawing the sheet into a gap between two calendaring rollers at a temperature of between the melting temperature of the plastomer and the melting temperature as determined by DSC of the polyolefin fibers, said gap having a width smaller than the thickness of the sheet; wherein the width of the gap is chosen to apply an impregnation pressure on the sheet of at least 20 bars.
    Type: Grant
    Filed: October 12, 2010
    Date of Patent: December 20, 2016
    Assignee: DSM IP ASSETS B.V.
    Inventors: Dietrich Wienke, Roelof Marissen, Martinus Johannes Nicolaas Jacobs, Leonardus Jacobus Johannes Wilhelmus Welzen
  • Artificial fibre as well as an artificial lawn for sports fields provided with such fibre
    Patent number: 6815059
    Abstract: The invention relates to a method for producing a foil of synthetic material composed of a first synthetic compound and a second synthetic compound, in which the first synthetic compound consists of a polymer and the second synthetic compound consists of a plastomer. The invention also relates to a synthetic fibre and to an artificial lawn suitable for sports fields, consisting of a substrate to which synthetic fibres according to the invention are fixed. Surprisingly, it has become apparent that when the fibres are according to the invention made from a combination of synthetic materials in which the first synthetic compound is a polymer and the second synthetic compound is a plastomer, the fibres will only exhibit a very minor any tendency to split, or even no such tendency at all, not even after stretching, also in the case of very intensive use in an artificial lawn.
    Type: Grant
    Filed: December 30, 2002
    Date of Patent: November 9, 2004
    Assignees: Ten Cate Thiolon B.V., DEX-Plastomer V.O.F.
    Inventors: Geurt Bastiaan Slootweg, Marinus Hendrikus Olde Weghuis, Frederik Van Der Gaag, Leonardus Jacobus Johannes Wilhelmus Welzen, Christian Antoine Marie Jean-Pierre Widdershoven
  • Artificial fibre as well as an artificial lawn for sports fields provided with such fibre
    Publication number: 20040001951
    Abstract: The invention relates to a method for producing a foil of synthetic material composed of a first synthetic compound and a second synthetic compound, in which the first synthetic compound consists of a polymer and the second synthetic compound consists of a plastomer.
    Type: Application
    Filed: December 30, 2002
    Publication date: January 1, 2004
    Inventors: Geurt Bastiaan Slootweg, Marinus Hendrikus Olde Weghuis, Frederik Van Der Gaag, Leonardus Jacobus Johannes Wilhelmus Welzen, Christian Antoine Marie Jean-Pierre Widdershoven