Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6688513 | Process for producing longitudinally welded tubes | Friedrich Harten | 2004-02-10 |
| 6685082 | Process for continuous production of longitudinally welded metal tubing | Christian Frohne | 2004-02-03 |