Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4244928 | Process for the production of pure aluminum oxide | Gerhard Haake, Gunter Geiler | 1981-01-13 |
| 4224287 | Process for the preparation of pure aluminum oxide | Gerhard Fischer, Gerhard Haake, Rudolf Siebert | 1980-09-23 |