Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4885405 | Process for the production of pure dimethylether and a catalyst used in the process | Horst Dornhagen, Hartmut Hammer, Bernd-Michael Haas | 1989-12-05 |
| 4802956 | Process for the purification of dimethylether by distillation | Horst Dornhagen, Hartmut Hammer | 1989-02-07 |