Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5073947 | Hearing device for a protective helmet | Hans Reddemann, Tronje von dem Hagen | 1991-12-17 |
| 4890338 | Supportive fastening means for a protective helmet | — | 1990-01-02 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5073947 | Hearing device for a protective helmet | Hans Reddemann, Tronje von dem Hagen | 1991-12-17 |
| 4890338 | Supportive fastening means for a protective helmet | — | 1990-01-02 |