Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6561732 | Driving pipe and method for the construction of an essentially horizontal pipeline | Michael Welzel | 2003-05-13 |
| 6352108 | Well pipe | Wilhelm Meyer, Willi Keul | 2002-03-05 |