Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7448469 | Silencer | Andreas Seyler, Joachim Von Der Hagen, Helmut Stonner | 2008-11-11 |
| 7387188 | Sound absorber | Uwe Keller, Joachim Von Der Hagen, Dietmar Metz, Helmut Stonner | 2008-06-17 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7448469 | Silencer | Andreas Seyler, Joachim Von Der Hagen, Helmut Stonner | 2008-11-11 |
| 7387188 | Sound absorber | Uwe Keller, Joachim Von Der Hagen, Dietmar Metz, Helmut Stonner | 2008-06-17 |