Patents by Inventor Kauko J. Karpale

Kauko J. Karpale 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).

  • Patent number: 4474735
    Abstract: A process for the recovery of valuable metals from roasted crude-oil sulfur-extraction catalyst waste is disclosed. In this process the value metals can be separated from aluminum in a single stage by treating the waste at elevated temperature and pressure with such an amount of sulfate solution that the waste dissolves and the aluminum simultaneously precipitates as alunite, which is separated from the solution which contains the other value metals. A sulfate solution is preferably added in such an amount that the concentration of sulfuric acid in the solution is 2-30 g/l at the end of the stage.
    Type: Grant
    Filed: September 28, 1982
    Date of Patent: October 2, 1984
    Assignee: Outokumpu Oy
    Inventors: Jussi K. Rastas, Kauko J. Karpale, Heikki Tiitinen
  • Patent number: 4362702
    Abstract: A hydrometallurgical process for the treatment of a raw material which contains oxides and ferrites of zinc, copper and cadmium is disclosed, wherein the raw material is neutral leached by means of a sulfuric-acid-bearing solution to leach the oxides without substantial dissolving of the ferrites, a ferrite-bearing residue is separated, and a sulfuric-acid-bearing or ferrisulfate-bearing solution is mixed with the residue in order to leach the ferrite and to precipitate the iron in the form of jarosite in the presence of alkali or ammonium ions under atmospheric conditions at C., and the solid phase is separated from the solution.
    Type: Grant
    Filed: September 29, 1981
    Date of Patent: December 7, 1982
    Assignee: Outokumpu Oy
    Inventors: Jussi K. Rastas, Jens R. Nyberg, Kauko J. Karpale, Lars-Goran Bjorkqvist