Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5011740 | Coating materials curing at room temperature | Johan Rietberg | 1991-04-30 |
| 4970096 | Coating materials curing at room temperature | Johan Rietberg | 1990-11-13 |
| 4535713 | Layout of a ship steering-house | — | 1985-08-20 |
| 4449471 | Steering combination of pusher tug and barges | — | 1984-05-22 |
| 4364322 | Liftable steering house or control cabin | — | 1982-12-21 |