Patents by Inventor Heikki A. Tiitinen

Heikki A. Tiitinen 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).

  • Process for the recovery of valuable metals from spent crude-oil sulfur-extraction catalysts
    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
  • Process for the recovery of cobalt from its impure, aqueous, in particular nickel-bearing, solutions and catalyst therefor
    Patent number: 4208380
    Abstract: Cobalt is recovered as a finely-divided and anhydrous salt from impure, nickel-bearing, aqueous solutions of cobalt, by exposing the aqueous solution to oxidation at an elevated temperature in the presence of ammonia and the respective ammonium salt, the formation of cobalt (III) hexammine ions is catalysed with activated carbon or solid sulfides, a cobalt (III) hexammine salt is crystallized from the solution, the salt is separated from the solution and pyrolysed to form a cobalt (II) salt, and the released ammonia is returned to the oxidation stage.
    Type: Grant
    Filed: July 7, 1978
    Date of Patent: June 17, 1980
    Assignee: Outokumpu Oy
    Inventors: Matti J. Hamalainen, Jussi K. Rastas, Heikki A. Tiitinen, Tom O. Niemi
  • Process for the production of extra fine cobalt powder
    Patent number: 4178172
    Abstract: Extra fine cobalt powder is manufactured by pyrolysing a cobalt (III)hexammine salt and then reducing the obtained oxide.
    Type: Grant
    Filed: July 3, 1978
    Date of Patent: December 11, 1979
    Assignee: Outokumpu Oy
    Inventors: Heikki A. Tiitinen, Jussi K. Rastas, Matti J. Hamalainen, Tom O. Niemi