Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6805386 | Door lock having a closing aid | Michael Helmer | 2004-10-19 |
| 6422615 | Closure device with shutting aid | Martin Roos | 2002-07-23 |
| 6390517 | Opening aid for door locks | — | 2002-05-21 |