Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7448469 | Silencer | Andreas Seyler, Hans-Joachim Lowe, Helmut Stonner | 2008-11-11 |
| 7387188 | Sound absorber | Uwe Keller, Hans-Joachim Lowe, Dietmar Metz, Helmut Stonner | 2008-06-17 |