Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5133689 | Focussed ventilation procedure of a work spot and a focussed ventilation means | Erkki Aalto, Teuvo Pellinen | 1992-07-28 |
| 5074198 | Focussed ventilation procedure for a work spot and apparatus used in the procedure | Erkki Aalto, Teuvo Pellinen, Tapio Alapuranen | 1991-12-24 |
| 5063834 | Focussed ventilation procedure and focussed ventilation means | Erkki Aalto, Teuvo Pellinen | 1991-11-12 |
| 4890544 | Air distribution system | Erkki Aalto, Teuvo Pellinen | 1990-01-02 |