Patents by Inventor Bertram W. Haupt

Bertram W. Haupt 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).

  • Roofing membrane
    Patent number: 5981030
    Abstract: A roofing membrane has a quantity of water-retaining particles fixed in the upper surface of the membrane. A fleece web affixed to the membrane surface in a quilt-like manner may provide zones of selectable size for holding the particles in place. By varying the amount of the absorber particles, the water-retaining capacity of the roofing membrane may be varied to the particular intended use, such as on a flat roof or a sloped roof.
    Type: Grant
    Filed: September 25, 1997
    Date of Patent: November 9, 1999
    Assignee: FAMOS GmbH
    Inventors: Bertram W. Haupt, Siegfried Heinz, Wolfgang Rudolf