Patents by Inventor Karl-Heinz Hofer

Karl-Heinz Hofer 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).

  • Gas purging device
    Patent number: 5437435
    Abstract: The present invention pertains to a gas purging device for introducing gases and/or solid reactants into the metal melt of a metallurgical crucible, consisting of a gas purging plug, a well nozzle sleeve surrounding it, and/or a well nozzle surrounding the plug or the nozzle brick, with a mounting device arranged in the area of the respective end face.
    Type: Grant
    Filed: September 7, 1993
    Date of Patent: August 1, 1995
    Assignee: Radex-Heraklith Industriebeteiligungs Aktiengesellschaft
    Inventors: Lorenz Dotsch, Karl-Heinz Hofer, Helmut Preyer
  • Refractory, ceramic, shaped member
    Patent number: 4884787
    Abstract: A refractory, ceramic, shaped member or nozzle. The shaped member is provided with a passage, preferably in the center. To prevent molten material that might penetrate the passage from penetrating therethrough and solidifying at such a later point, a cooling device may be provided in the passage.
    Type: Grant
    Filed: May 24, 1988
    Date of Patent: December 5, 1989
    Assignee: Radex Deutschland Aktiengesellschaft fur feuerfeste Erzeugnisse
    Inventors: Dotsch Lorenz, Karl-Heinz Hofer, Jean-Louis Retrayt, Bernd Kull