Patents by Inventor Franz-Josef Hegemann

Franz-Josef Hegemann 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).

  • Ascension pipe for coke ovens
    Patent number: 4564421
    Abstract: An ascension pipe for coke oven installations wherein the inner periphery of the pipe is lined with refractory brick and wherein a tube of heat-resistant steel covers the inner periphery of the brick lining. Only minor deposits form on this tube during operation of the coke oven. These deposits can be removed easily by vertically-guided scrapers without damaging the refractory, in contrast to prior art ascension pipes wherein the deposits must be removed from the refractory bricks themselves.
    Type: Grant
    Filed: May 21, 1982
    Date of Patent: January 14, 1986
    Assignee: Dr. C. Otto & Comp. GmbH
    Inventors: Theo Koddenberg, Franz-Josef Hegemann