Issued Patents All Time
Showing 26–36 of 36 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4827099 | Method and apparatus for continuous production of tubular bodies by means of laser longitudinal seam welding | Rolf Krebs, Otto Welsing, Friedhelm Retzlaff, Friedhelm Gunter, Hans-Jürgen Wahl +1 more | 1989-05-02 |
| 4797173 | Apparatus for face welding bundles of thermoplastic moldings under pressure | Klaus E. Pohlmann, Harmut Schikowsky | 1989-01-10 |
| 4773956 | Process for connecting bodies having hollow sections to molded bodies made of thermoplastic | — | 1988-09-27 |
| 4733718 | Heat exchanger bodies made of plastic | Hartmut Schikowsky, Herbert W. Helm, Klaus-Ernst Poehlmann, Karl Schanz, Heinz Vetter | 1988-03-29 |
| 4732623 | Method of making high strength steel tube | Friedrich Reith, Friedhelm Retzlaff, Karl H. Schlusnus | 1988-03-22 |
| 4724902 | Plate heat exchanger | — | 1988-02-16 |
| 4688319 | Multi-layer helical seam steel pipe | Friedrich-Otto Koch, Adolf Peeck, Werner Wennemann | 1987-08-25 |
| 4656332 | Use of the laser welding process for and method of manufacturing of welded construction parts for exhaust installations | Manfred Gerber, Rolf Krebs, Friedhelm Retzlaff | 1987-04-07 |
| 4579273 | Welded pipe connection | Karl Dahmen, Martin Henning | 1986-04-01 |
| 4414042 | Method of making high strength steel tube | Friedrich Reith, Friedhelm Retzlaff, Karl H. Schlusnus | 1983-11-08 |
| 4247033 | Method of and device for producing multi-layer pipes | Karl Dahmen, Jurgen Engel, Martin Henning, Werner Wennemann | 1981-01-27 |