Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6789318 | Method for producing longitudinally welded helically corrugated metal tubing | Christian Frohne, Michael Meyer | 2004-09-14 |
| 6688513 | Process for producing longitudinally welded tubes | Klaus Porcher | 2004-02-10 |