Issued Patents All Time
Showing 1–18 of 18 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7811357 | Method for recovering rare metals in zinc leaching process | Marko Lahtinen, Mikko Ruonala, Kurt Svens, Stig-Göran Huldén | 2010-10-12 |
| 7615100 | Method for the precipation of silica in connection with zinc ore leaching | Pertti Pekkala, Panu Talonen, Marja Riekkola-Vanhanen | 2009-11-10 |
| 7118719 | Method for the hydrolytic precipitation of iron | — | 2006-10-10 |
| 6712874 | Method for the reduction of nickel from an aqueous solution | Matti Hämäläinen, Kari Knuuttila | 2004-03-30 |
| 6702871 | Method for the reduction of nickel | Matti Hämäläinen, Kari Knuutila | 2004-03-09 |
| 6340450 | Method for leaching zinc concentrate in atmospheric conditions | Aimo Järvinen | 2002-01-22 |
| 6206951 | Method for leaching nickel from nickel matte | — | 2001-03-27 |
| 6039790 | Method for recovering nickel hydrometallurgically from two different nickel mattes | Stig-Erik Hultholm | 2000-03-21 |
| 5628817 | Method for leaching nickel-copper matte employing substantially neutral leaching solutions | Stig-Erik Hultholm, Terry Holohan | 1997-05-13 |
| 5585079 | Method for leaching material containing zinc oxide and zinc silicate | — | 1996-12-17 |
| 5199974 | Method for recovering metal contents of metallurgic waste precipitates or waste dusts by suspension smelting | — | 1993-04-06 |
| 5178842 | Method for precipitating and separating metals | — | 1993-01-12 |
| 5120353 | Hydrometallurgic method for processing raw materials containing zinc sulphide | Aimo Järvinen | 1992-06-09 |
| 4698139 | Hydrometallurgical method for treating valuable metal raw materials containing chlorides and fluorides | Jaakko Poijärvi | 1987-10-06 |
| 4526650 | Method for regenerating pickling acids | Seppo I. Blomquist, Markku T. Saarela, Hannu Pouru, Bror Nyman, Kaj Lindroos +1 more | 1985-07-02 |
| 4452762 | Hydrometallurgical process for the recovery of valuable metals from metallic alloys | Bror Nyman, Stig-Erik Hultholm, Asko Parviainen, Jussi K. Rastas | 1984-06-05 |
| 4220627 | Process for the treatment of raw materials containing arsenic and metal | Stig-Erik Hultholm, Bror Nyman, Jussi K. Rastas | 1980-09-02 |
| 4219354 | Hydrometallurgical process for the treatment of oxides and ferrites which contain iron and other metals | Jussi K. Rastas, Seppo Heimala, Sitg-Erik Hultholm, Jaakko T. I. Poijarvi | 1980-08-26 |