Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4827099 | Method and apparatus for continuous production of tubular bodies by means of laser longitudinal seam welding | Otto Welsing, Friedhelm Retzlaff, Friedhelm Gunter, Hans-Jürgen Wahl, Manfred Gerber +1 more | 1989-05-02 |
| 4656332 | Use of the laser welding process for and method of manufacturing of welded construction parts for exhaust installations | Heinz Gross, Manfred Gerber, Friedhelm Retzlaff | 1987-04-07 |
| 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, Peter Schorr, Heinz Strauch | 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, Peter Schorr, Heinz Strauch | 1985-08-13 |