Patents by Inventor Stef Willemsen

Stef Willemsen 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).

  • Flexible continuous tape from multifilament yarn and method for making these
    Patent number: 8031996
    Abstract: A method for making a flexible fibrous continuous tape containing 60 to 98 wt % fiber based on the weight of the tape, from multifilament yarn selected from aramid, glass, aromatic polyester, and rigid rod polymer, comprising the steps: a1) spreading the filaments of the yarn to obtain a filament layer having a cross sectional aspect ratio (w/h) of 2 to 2000; and b1) treating the spread filaments with a curable resin, or a liquid thermoplastic resin or wax; or a2) treating the yarn with the curable resin, or the liquid thermoplastic resin or wax; and b2) spreading the filaments of the yarn to obtain a filament layer having a cross sectional aspect ratio (w/h) of 2 to 2000; followed by c) fixating the filaments by curing or solidifying the resin to obtain the tape, wherein steps a1-b1, respectively a2-b2, and c are performed in-line.
    Type: Grant
    Filed: November 26, 2008
    Date of Patent: October 4, 2011
    Assignee: Teijin Aramid B.V.
    Inventors: Stef Willemsen, Peter Gerard Akker, Huibert Cornelis Kwint, Adrianus Johannus Wilhelmus Van Haren
  • FLEXIBLE CONTINUOUS TAPE FROM MULTIFILAMENT YARN AND METHOD FOR MAKING THESE
    Publication number: 20100266247
    Abstract: A method for making a flexible fibrous continuous tape containing 60 to 98 wt % fiber based on the weight of the tape, from multifilament yarn selected from aramid, glass, aromatic polyester, and rigid rod polymer, comprising the steps: a1) spreading the filaments of the yarn to obtain a filament layer having a cross sectional aspect ratio (w/h) of 2 to 2000; and b1) treating the spread filaments with a curable resin, or a liquid thermoplastic resin or wax; or a2) treating the yarn with the curable resin, or the liquid thermoplastic resin or wax; and b2) spreading the filaments of the yarn to obtain a filament layer having a cross sectional aspect ratio (w/h) of 2 to 2000; followed by c) fixating the filaments by curing or solidifying the resin to obtain the tape, wherein steps a1-b1, respectively a2-b2, and c are performed in-line.
    Type: Application
    Filed: November 26, 2008
    Publication date: October 21, 2010
    Applicant: TEIJIN ARAMID B.V.
    Inventors: Stef Willemsen, Peter Gerard Akker, Huibert Cornelis Kwint, Adrianus Johannus Wilhelmus Van Haren