Patents by Inventor Gustav Drouven

Gustav Drouven 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).

  • Article comprising foam plastic covered with an outer surface strengthening layer
    Patent number: 3940524
    Abstract: An article such as a structural member composed of a core of foamed material having bonded thereto for strengthening thereof, a laminate made up of an outer skin and a reinforcing insert. The reinforcing insert comprises at least one mat-loose fiber sheet combination with the mat disposed adjacent the skin and the loose fiber sheet disposed adjacent the foamed core. The material forming the skin penetrates from the skin, at least partially through the insert to an outer portion of the foamed core, and at least through the outermost mat so that the outermost mat is completely embedded in the material forming the skin.
    Type: Grant
    Filed: May 28, 1974
    Date of Patent: February 24, 1976
    Assignee: Bayer Aktiengesellschaft
    Inventors: Peter Hoppe, Gustav Drouven, Helmut Leyer, Johann Muller