Patents by Inventor Stig-Göran Huldén

Stig-Göran Huldén 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 recovering rare metals in zinc leaching process
    Patent number: 7811357
    Abstract: Sulphidic zinc concentrate usually also includes small amounts of rare metals such as indium and gallium. If the content of these metals in the raw material is sufficiently high, their recovery may be economically worthwhile. In the method according to the invention the recovery of indium and other desirable rare metals takes place in a zinc leaching process, in which at least part of the sulphidic concentrate is leached directly without roasting.
    Type: Grant
    Filed: December 27, 2006
    Date of Patent: October 12, 2010
    Assignee: Outotec Oyj
    Inventors: Marko Lahtinen, Mikko Ruonala, Kurt Svens, Stig-Göran Huldén, Sigmund Fugleberg