Patents by Inventor Donald Hellmann

Donald Hellmann 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).

  • Burner, in particular atmospheric pre-mix gas burner, and cooling rods therefor
    Patent number: 4915620
    Abstract: Cooling rods (2) take away the heat from the flame area of a burner (1). Various embodiments of supports (4) for these cooling rods (2) are disclosed.
    Type: Grant
    Filed: August 20, 1987
    Date of Patent: April 10, 1990
    Assignee: Joh. Vaillant GmbH & Co.
    Inventors: Bernd Bittmann, Donald Hellmann, Kurt Pelzer, Thomas Pieper, Jurgen Tenhumberg, Horst J. Schilling