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, Herbert Damsohn, Werner Helms, Roland Hemminger +3 more | 1997-09-23 |
| 5640879 | Method and device for expanding metal tubes | Herbert Damsohn, Werner Helms, Roland Hemminger | 1997-06-24 |
| 5618963 | Process for the preparation of sterically hindered hydroxybenzylphosphonates | Thomas Engert, Hans-Werner Stephan | 1997-04-08 |