Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6274104 | Non-ferrous metal recovery method utilizing a melt sulphation reaction | Pekka J. Saikkonen | 2001-08-14 |
| 5082638 | Process of recovering non-ferrous metal values, especially nickel, cobalt, copper and zinc, by using melt and melt coating sulphation, from raw materials containing said metals | Pekka J. Saikkonen | 1992-01-21 |
| 4579726 | Process and apparatus for the removal of mercury from sulfur dioxide-bearing hot and moist gases | Aimo M. F. Kuivala, Jaakko Leppinen, Jussi K. Poijarvi | 1986-04-01 |
| 4474735 | Process for the recovery of valuable metals from spent crude-oil sulfur-extraction catalysts | Kauko Karpale, Heikki A. Tiitinen | 1984-10-02 |
| 4452762 | Hydrometallurgical process for the recovery of valuable metals from metallic alloys | Sigmund Fugleberg, Bror Nyman, Stig-Erik Hultholm, Asko Parviainen | 1984-06-05 |
| 4385038 | Flotation recovery of lead, silver and gold as sulfides from electrolytic zinc process residues | Kaarlo M. J. Saari, Vaino V. H. Hintikka, Jaakko Leppinen, Aimo Järvinen | 1983-05-24 |
| 4383979 | Process for the recovery of zinc, copper and cadmium in the leaching of zinc calcine | Lars-Goran Bjorkqvist, Raija-Leena Gisler, Simo S. Liukkonen | 1983-05-17 |
| 4366127 | Hydrometallurgical process for the recovery of lead, silver and gold, as well as zinc, from impure jarosite residues of an electrolytic zinc process | Jens Nyberg | 1982-12-28 |
| 4362702 | Hydrometallurgical process for the treatment of a raw material which contains oxide and ferrite of zinc, copper and cadmium | Jens Nyberg, Kauko Karpale, Lars-Goran Bjorkqvist | 1982-12-07 |
| 4355005 | Process for the treatment of a raw material which contains oxide and ferrite of zinc, copper and cadmium | Pekka J. Saikkonen, Risto J. Honkala | 1982-10-19 |
| 4220627 | Process for the treatment of raw materials containing arsenic and metal | Sigmund Fugleberg, Stig-Erik Hultholm, Bror Nyman | 1980-09-02 |
| 4219354 | Hydrometallurgical process for the treatment of oxides and ferrites which contain iron and other metals | Sigmund Fugleberg, Seppo Heimala, Sitg-Erik Hultholm, Jaakko T. I. Poijarvi | 1980-08-26 |
| 4208380 | Process for the recovery of cobalt from its impure, aqueous, in particular nickel-bearing, solutions and catalyst therefor | Matti Hämäläinen, Heikki A. Tiitinen, Tom O. Niemi | 1980-06-17 |