Patents by Inventor Hjalte Rognsaa

Hjalte Rognsaa 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).

  • Method for melting ferrous scrap metal and chromite in a submerged arc furnace to produce a chromium containing iron
    Patent number: 5654976
    Abstract: The process feeds a mixture of scrap metal, chromite, flux materials, carbonaceous material and wood chips to a submerged arc furnace to make a base iron suitable for iron and steel purposes. The mixture contains about 1-60% chromite, about 1 to 20% flux materials, about 5 to 35% carbonaceous material, about 0-10% wood chips, all based on the weight of scrap in the mixture. By maintaining the charge in the furnace, good energy efficiencies are obtained.
    Type: Grant
    Filed: April 18, 1995
    Date of Patent: August 5, 1997
    Assignee: Elkem Technology a/s
    Inventors: Peter Cowx, Hjalte Rognsaa