Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880446 | Process for heating up moist gases containing hydrogen halides | Wolfgang Dietz, Rudolf Gerken, Peter Clasen | 1989-11-14 |
| 4834954 | Process for cleaning flue gases | Karl-Heinz Dorr, Hugo Grimm, Heinz Neumann, Rudolf Gerken | 1989-05-30 |
| 4824655 | Process for the preparation of sulphur dioxide | Rudolf Gerken | 1989-04-25 |
| 4797163 | Process for the production of titanium dioxide pigments | Karl-Heinz Schultz | 1989-01-10 |