Patents by Inventor Karl J. V. Svensson

Karl J. V. Svensson 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 purifying iron oxide
    Patent number: 5312602
    Abstract: A method is described for purifying iron oxide, for example, in the form of magnetite or hematite slime, which preferably contains quartz as the impurity. The method comprises calcinating the iron oxide together with alkali carbonate and thereafter leaching with a weak aqueous solution of an acid or a mixture of acids.
    Type: Grant
    Filed: September 8, 1992
    Date of Patent: May 17, 1994
    Assignee: A/S Sydvaranger
    Inventors: Karl J. V. Svensson, Bo H. Zander