Issued Patents 1982
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4362323 | Pipe part with a socket end | Bernhard Lodder, Gerard A. E. Blok | 1982-12-07 |
| 4341392 | Plastics pipes having walls with lengthwise extending channels | — | 1982-07-27 |
| 4323339 | Device for manufacturing plastics pipes with oblong channels | Johan de Kok | 1982-04-06 |