Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4865825 | Process for the decomposition of sodium aluminate liquor for the production of alumina | Henri Grobelny | 1989-09-12 |
| 4818499 | Apparatus for the decomposition of sodium aluminate liquor for the production of alumina | Henri Grobelny | 1989-04-04 |