Patents by Inventor Hein Bulters

Hein Bulters 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).

  • Fiber reinforced sandwich tube
    Patent number: 4080999
    Abstract: The invention relates to a sandwich tube comprising an inner and an outer fiber reinforced layer of thermosetting resin and an intermediate layer therebetween consisting of inorganic filler material coated with thermosetting resin and obtained by spraying a finely divided resin into a case of loosely laid inorganic filler material. A non woven is present between the intermediate layer and the outer fiber reinforced layer.
    Type: Grant
    Filed: December 8, 1975
    Date of Patent: March 28, 1978
    Assignee: Industriele Onderneming Wavin N.V.
    Inventors: Hein Bulters, Gerrit Heidemann, Warner Jan DE Putter