Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874557 | Process for the preparation of perfluorinated carbonyl fluorides | Gunter Siegemund, Werner Schwertfeger | 1989-10-17 |
| 4835318 | Process for the preparation of aryl perfluoroalkyl ketones | Gunter Siegemund, Klaus Schlich, Ingo Ruppert, deceased | 1989-05-30 |