Patents by Inventor Helmut Zanker

Helmut Zanker 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).

  • Construction panel made of polyurethane integral hard foam
    Patent number: 4603078
    Abstract: A polyurethane integral hard foam construction panel comprises a denser edge zone and a porous core, the surface of the construction panel being enameled, and is used as a roofing plate, in particular as a small format, nailed roof cover plate.For that purpose the invention provides that the polyurethane integral hard foam of the construction panel includes fillers, namely 1 to 65% by weight flame-retardants such as aluminum hydroxide [Al(OH).sub.3 ] and/or Exolite and 1 to 90% slate powder.
    Type: Grant
    Filed: April 18, 1984
    Date of Patent: July 29, 1986
    Assignee: Fulgurit GmbH & Co. Kommanditgesellschaft
    Inventors: Helmut Zanker, Joachim Kleiss