Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5685143 | Catalytic exhaust gas purifier and catalytic method of purifying exhaust gas | Eero Aitta | 1997-11-11 |
| 5590522 | Catalytic combustion engine exhaust gas purifier with additional air supply | Eero Aitta | 1997-01-07 |