Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4885455 | Process for terminating closed through-hole plasma arc welding | Jean-Pierre Schultz | 1989-12-05 |
| 4855566 | Process for striking an arc in electric welding and welding torch employing said process | Jean-Francois Hays, Pierre Legrand, Michel Delzenne, Bernard Reynaud, Pierre Gaillard | 1989-08-08 |