Issued Patents 1997
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5669440 | Heat exchanger having a welded pipe which has a reduced wall thickness at location of the weld seam | Dieter Bauer, Ralf Bochert, Werner Helms, Roland Hemminger, Herbert Hunzelmann +3 more | 1997-09-23 |
| 5665261 | Motor vehicle electric heating device having angled off metal heating plates arranged to mutually abut one another at opposite ends | Karl-Gerd Krumbach, Michael Loehle, Eberhard Zwittig | 1997-09-09 |
| 5640879 | Method and device for expanding metal tubes | Werner Helms, Roland Hemminger, Walter Wolf | 1997-06-24 |