Patents by Inventor Jean-Louis Retrayt

Jean-Louis Retrayt 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).

  • Process for producing a gas purging plug with increased resistance to infiltration and oriented porosity
    Patent number: 5225247
    Abstract: A process for producing a plug with increased resistance to infiltration and oriented porosity for use in metallurgical melting crucibles, in which the matrix material of the plug is subjected to an impregnating treatment.
    Type: Grant
    Filed: July 17, 1991
    Date of Patent: July 6, 1993
    Assignee: Radex-Heraklith Industriebeteiligungs Aktiengesellschaft
    Inventors: Lorenz Dotsch, Helmut Preyer, Frich Renfordt, Jean-Louis Retrayt
  • 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