Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4842835 | Process of purifying flue gases | Karl-Heinz Dorr, Hugo Grimm, Wolfgang Fennemann, Norbert Ohlms | 1989-06-27 |
| 4834954 | Process for cleaning flue gases | Karl-Heinz Dorr, Hugo Grimm, Rudolf Gerken, Gunter Lailach | 1989-05-30 |