Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4782913 | Constructional element with acoustic properties | Manfred Hoffmann | 1988-11-08 |
| 4705139 | Sound insulation part for surfaces | Heinemann Gahlau, Manfred Hoffmann | 1987-11-10 |