Patents by Inventor Gerrit Heidemann

Gerrit Heidemann 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
  • Connection for foam insulated pipes
    Patent number: 4019761
    Abstract: A pipe having an annular ring of a foam plastic material on its outer surface and a covering layer of thermoplastic material on the outer surface of the foam plastic ring. An opening between two free ends of foam plastic layer ring lying opposite each other of adjoining pipes is closed by a connecting layer which cooperates sealingly with the covering layers. A ring of rigid material is positioned under the covering layer at the point where the connecting layer is clamped onto the covering layer.
    Type: Grant
    Filed: January 7, 1972
    Date of Patent: April 26, 1977
    Assignee: Industriele Onderneming Wavin N.V.
    Inventor: Gerrit Heidemann
  • Connections for insulated pipes
    Patent number: 3992237
    Abstract: A foam plastic layer is sprayed onto a metal pipe, whereafter a tape of polyethylene at the extrusion temperature is helically wound around the foam layer.
    Type: Grant
    Filed: February 6, 1975
    Date of Patent: November 16, 1976
    Assignee: Industriele Onderneming Wavin N.V.
    Inventors: Willem Gerholt, Gerrit Heidemann