Patents by Inventor Aart Klinkhamer

Aart Klinkhamer 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).

  • Composite materials comprising PPTA and nanotubes
    Patent number: 7758960
    Abstract: Disclosed is a composite material comprising PPTA (poly-p-phenyleneterephthalamide) and nanotubes having an aspect ratio of at least 100 and a cross-sectional diameter of 5 nm or less, the composite material containing up to 12 wt. % of nanotubes, obtainable by adding the nanotubes to sulfuric acid, decreasing the temperature to solidify the mixture, adding PPTA to the solid mixture, heating to above the solidifying point and mixing the mixture, and spinning, casting, or molding the mixture to the composite material.
    Type: Grant
    Filed: March 27, 2009
    Date of Patent: July 20, 2010
    Assignee: Teijin Aramid B.V.
    Inventors: Hanneke Boerstoel, Hendrik Swierenga, Aart Klinkhamer
  • Composite materials comprising PPTA and nanotubes
    Publication number: 20090252960
    Abstract: Disclosed is a composite material comprising PPTA (poly-p-phenyleneterephthalamide) and nanotubes having an aspect ratio of at least 100 and a cross-sectional diameter of 5 nm or less, the composite material containing up to 12 wt. % of nanotubes, obtainable by adding the nanotubes to sulfuric acid, decreasing the temperature to solidify the mixture, adding PPTA to the solid mixture, heating to above the solidifying point and mixing the mixture, and spinning, casting, or molding the mixture to the composite material.
    Type: Application
    Filed: March 27, 2009
    Publication date: October 8, 2009
    Applicant: TEIJIN ARAMID B.V.
    Inventors: Hanneke Boerstoel, Aart Klinkhamer, Hendrik Swierenga
  • Composite materials comprising PPTA and nanotubes
    Patent number: 7534486
    Abstract: The invention pertains to a composite material comprising PPTA (poly-p-phenyleneterephthalamide) and nanotubes having an aspect ratio of at least 100 and a cross-sectional diameter of 5 nm or less, the composite material containing up to 12 wt. % of nanotubes, obtainable by adding the nanotubes to sulfuric acid, decreasing the temperature to solidify the mixture, adding PPTA to the solid mixture, heating to above the solidifying point and mixing the mixture, and spinning, casting, or molding the mixture to the composite material. The process comprises the steps: a) adding nanotubes having an aspect ratio of at least 100 and a cross-sectional diameter of 5 nm or less to sulfuric acid at a temperature above the solidifying point of the sulfuric acid; b) decreasing the temperature to below the solidifying point of the sulfuric acid and mixing for a sufficient time to solidify the mixture; c) adding PPTA to the solid mixture; and d) heating to above the solidifying point and mixing the mixture.
    Type: Grant
    Filed: March 18, 2005
    Date of Patent: May 19, 2009
    Assignee: Teijin Aramid B.V.
    Inventors: Hanneke Boerstoel, Hendrik Swierenga, Aart Klinkhamer
  • Composite materials comprising ppta and nanotubes
    Publication number: 20070160821
    Abstract: The invention pertains to a composite material comprising PPTA (poly-p-phenyleneterephthalamide) and nanotubes having an aspect ratio of at least 100 and a cross-sectional diameter of 5 nm or less, the composite material containing up to 12 wt. % of nanotubes, obtainable by adding the nanotubes to sulfuric acid, decreasing the temperature to solidify the mixture, adding PPTA to the solid mixture, heating to above the solidifying point and mixing the mixture, and spinning, casting, or molding the mixture to the composite material. The process comprises the steps: a) adding nanotubes having an aspect ratio of at least 100 and a cross-sectional diameter of 5 nm or less to sulfuric acid at a temperature above the solidifying point of the sulfuric acid; b) decreasing the temperature to below the solidifying point of the sulfuric acid and mixing for a sufficient time to solidify the mixture; c) adding PPTA to the solid mixture; and d) heating to above the solidifying point and mixing the mixture.
    Type: Application
    Filed: March 18, 2005
    Publication date: July 12, 2007
    Applicant: Teijin Twaron B.V.
    Inventors: Hanneke Boerstoel, Aart Klinkhamer, Hendrik Swierenga