Patents by Inventor Leif Kopperstad

Leif Kopperstad 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).

  • Apparatus for collection of tapping gases from electric smelting furnaces
    Patent number: 4081178
    Abstract: Apparatus for collection of tapping gases to prevent worker exposure to them is disclosed.The apparatus comprises a plurality of screens in combination with an opening in the floor positioned so that tapping gases are removed by the smoke hood without the need for separate tapping gas removal apparatus.
    Type: Grant
    Filed: January 24, 1977
    Date of Patent: March 28, 1978
    Assignee: Elkem-Spigerverket A/S
    Inventors: Leif Kopperstad, Halldor Opedal