Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6270738 | Process for preparing usable products from an impure ferric sulfate solution | Stefan Jafverstrom, Timo Kenakkala | 2001-08-07 |
| 6217768 | Method for treating sludge from wastewater treatment | Bengt HANSEN | 2001-04-17 |
| 6010630 | Method for recovering at least one metal from an acidified waste water sludge | Pekka Oinas | 2000-01-04 |
| 5942199 | Method for the treatment of impure aluminium oxide | Maire Iida Annikki Mattila, Anna-Mari Kristiina Stein, Sirpa-Liisa Katariina Mattila, Gerard Verkoijen | 1999-08-24 |
| 5888404 | Method for treating waste water sludge | — | 1999-03-30 |
| 5720882 | Treatment method for waste water sludge comprising phoshorous, heavy metals and at least one metal | Kjell Stendahl | 1998-02-24 |
| 5674402 | Method for the treatment of water treatment sludge | Rolf Nilsson | 1997-10-07 |
| 5250276 | Method for preparing ferric chloride | Pekka Knuuttila, Vesa-Pekka Judin, Juhatuomas Vuorisalo, Simo Salanne | 1993-10-05 |