Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4591193 | Line pipe of synthetic material especially for waste water | Heinrich Oltmanns, Axel Granz, Willi Dalhoff | 1986-05-27 |
| 4570976 | Sleeve-shaped coupling for pipelines | Heinz Hetzenecker | 1986-02-18 |