Patents by Inventor Hermann Kiefer

Hermann Kiefer 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).

  • Frame for doors, windows and the like
    Patent number: 4130976
    Abstract: The present invention relates to a frame for doors, windows and the like. The frame is provided with a foamed synthetic resin hollow profile having a densified outer skin. Further provided is a hollow metal profile within the foamed synthetic resin profile and lying against the corner surface of the resin profile.
    Type: Grant
    Filed: March 7, 1977
    Date of Patent: December 26, 1978
    Assignee: Gerbruder Kommerling Kunststoffwerke G.m.b.H.
    Inventors: Helmut Kesseler, Gerd L. Anstadt, Hermann Kiefer