Patents by Inventor Per Poppe

Per Poppe 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).

  • Patent number: 5103072
    Abstract: The present invention relates to a plasma torch intended for being submerged into a bath of molten metal, such as for example a steel melt. The torch comprises an outer electrode made from a non-consumable material and an inner electrode, where at least the outer electrode is made from a copper pipe having internal channels for circulation of a cooling medium, said copper pipe at least on the outside having a layer of refractory material.The layer of refractory material has a thickness between 1 and 5 mm and is made from Al.sub.2 O.sub.3 or from ZrO.sub.2 stabilized with 5-25% by weight of MgO and/or Y.sub.2 O.sub.3 or oxides of other rare earth elements.
    Type: Grant
    Filed: June 18, 1990
    Date of Patent: April 7, 1992
    Assignee: Elkem Technology a/s
    Inventors: Inger J. Eikeland, Per Poppe