Issued Patents 1997
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5699840 | Retention system and method for preventing the efflux of substances from installations into the surroundings | Eberhard Ritter, Frank Westphal, Guido Wehmeier | 1997-12-23 |