Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6394600 | Replaceable lens system | Michael Horn | 2002-05-28 |
| 6338341 | Protective breathing mask | Ralf Drews | 2002-01-15 |
| 5782235 | Valved filter connection piece for a gas mask | Rüdiger Müller | 1998-07-21 |
| 5625902 | Protective hood made of an elastic material | Ralf Drews | 1997-05-06 |