Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9085020 | Method and apparatus for homogenizing and stabilizing an iron-bearing residue | Leena Lehtinen, Bror Nyman, Timo Haakana, Jari Tiihonen | 2015-07-21 |
| 7811357 | Method for recovering rare metals in zinc leaching process | Mikko Ruonala, Kurt Svens, Stig-Göran Huldén, Sigmund Fugleberg | 2010-10-12 |
| 7682581 | Method for the removal of copper from a zinc sulphate solution | Leena Lehtinen, Marika Jyrälä, Matti Vuokko | 2010-03-23 |
| 7517383 | Method for recovery of zinc by countercurrent leaching | Aimo Järvinen, Heikki Takala | 2009-04-14 |
| 7294319 | Method for precipitating iron from a zinc sulphate solution as hematite | Leena Lehtinen, Heikki Takala | 2007-11-13 |
| 6492551 | Method for manufacturing alkali metal or alkaline-earth metal formate | Erkki Paatero, Kari Saari, Pekka Vapaaoksa | 2002-12-10 |
| 6429333 | Method for preparing formic acid | Kari Saari, Esko Tirronen, Antti Vuori | 2002-08-06 |