Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6403197 | Filter material | Heinz Wandel | 2002-06-11 |
| 6364978 | Method and apparatus for producing a filter material | Heinz Wandel | 2002-04-02 |
| 5736041 | Filter element | — | 1998-04-07 |
| 4974586 | Breathing mask | Heinz Wandel | 1990-12-04 |
| 4850347 | Face mask | — | 1989-07-25 |