Patents by Inventor Bruno Heitzmann

Bruno Heitzmann 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).

  • Grid plate of plastic material
    Patent number: 4826351
    Abstract: A grid plate of plastic material, with a rough, slippage-impairing top side and a rib-reinforced bottom side. The individual grid plates are kept together by a lockable, but again disconnectable, plug-in connection. The grid plates serve as fastening elements for parking places, road embankments, road ramps, and the like.
    Type: Grant
    Filed: November 2, 1987
    Date of Patent: May 2, 1989
    Assignee: Spiess Kunstoff-Recycling GmbH & Co.
    Inventors: Karl Haberhauer, Klaus D. Feyerabend, Bruno Heitzmann, Alfred Lieberenz, Harry Schimmel