Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4995991 | Method and apparatus for improving the operation of a disc filter | Risto Ljokkoi, Pekka Purho, Erkki Savolainen, Jari Siitonen | 1991-02-26 |
| 4678574 | Disc filter | Erkki Savolainen, Raimo Kohonen | 1987-07-07 |