Patents by Inventor Johannes Gerardus van der Graaf

Johannes Gerardus van der Graaf 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).

  • PIPE ELEMENT FOR CONSTRUCTING A DOUBLE WALLED PIPELINE
    Publication number: 20130240076
    Abstract: A pipe element (1) for constructing a double walled pipeline includes an outer pipe element (3) and an inner pipe element (4) located inside the outer pipe element (3), the outer pipe element (3) has a substantially annular form in cross section and includes an inner surface (16). The inner pipe element (4) has a substantially annular form in cross section and includes s an outer surface (15), the diameter of the inner surface is larger than the diameter of the outer surface. The outer pipe element (3) is made from a metallic material, and the inner pipe element (4) is made from a non-metallic material.
    Type: Application
    Filed: August 5, 2011
    Publication date: September 19, 2013
    Applicant: HEEREMA MARINE CONTRACTORS NEDERLAND B.V.
    Inventor: Johannes Gerardus van der Graaf