Patents by Inventor Jacob Sandberg

Jacob Sandberg 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).

  • Reduction of chromium content in slag during melting of stainless steel in electric arc furnaces
    Patent number: 6478840
    Abstract: The present invention relates to a method for reduction of chromium content in slag during melting of stainless steel in electric arc furnaces where steel scrap and additive alloys are melted in an electric steel furnace, whereafter molten steel and slag are tapped into a ladle, removal of the slag from the steel in the ladle, transferring of the molten steel from the ladle to a converter wherein the steel is refined and where the chemical composition of the steel is adjusted by addition of alloying elements. According to the invention fine particulate ferrosilicon is added to the slag during the time interval between the slag and the steel are melted, but before the molten steel and slag is tapped into the ladle.
    Type: Grant
    Filed: June 4, 2001
    Date of Patent: November 12, 2002
    Assignee: Elkem ASA
    Inventors: Ole Svein Klevan, Jacob Sandberg