Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4621176 | Method of and device for monitoring and/or controlling welding current in the high-frequency resistance pressure welding of pipes with longitudinal seams | Wilfried Kliesch, Friedrich-Otto Koch, Hans-Jürgen Wahl, Rolf Krebs, Peter Schorr | 1986-11-04 |
| 4535215 | Method and device for controlling the welding process in the manufacturing of pipes with longitudinal seams | Wilfried Kliesch, Friedrich-Otto Koch, Hans-Jürgen Wahl, Rolf Krebs, Peter Schorr | 1985-08-13 |