Patents by Inventor Marika Jyrälä

Marika Jyrälä 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 the removal of copper from a zinc sulphate solution
    Patent number: 7682581
    Abstract: The purpose of the invention is to remove copper selectively from a concentrated zinc sulphate solution by ion exchange. The method enables a significant reduction in the use of zinc powder during the solution purification of zinc sulphate solution and makes possible to avoid usage of arsenic or antimony trioxides as a precipitation chemical. The method is to be combined with the chloride removal that occurs as a sub-stage of solution purification.
    Type: Grant
    Filed: October 22, 2004
    Date of Patent: March 23, 2010
    Assignee: Outotec Oyj
    Inventors: Leena Lehtinen, Marko Lahtinen, Marika Jyrälä, Matti Vuokko
  • Method for removal of silver from a copper chloride solution
    Patent number: 7559971
    Abstract: The invention relates to a method for removing silver from a chloride solution in a copper recovery process. According to this method, silver is removed using fine-grained copper powder and mercury. Silver removal occurs in at least two stages and mercury is fed into the solution at a certain molar ratio with regard to the silver in the solution.
    Type: Grant
    Filed: September 30, 2003
    Date of Patent: July 14, 2009
    Assignee: Outotec Oyj
    Inventors: Olli Hyvärinen, Marika Jyrälä