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, Willi Dalhoff, Rolf Othold | 1986-05-27 |
| 4299070 | Box formed building panel of extruded plastic | Heinrich Oltmanns | 1981-11-10 |