Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5166118 | Catalyst for the hydrogenation of hydrocarbon material | Klaus Kretschmar, Klaus Niemann, Jose Guitian, Julio Krasuk, Franzo Marruffo +1 more | 1992-11-24 |
| 5064523 | Process for the hydrogenative conversion of heavy oils and residual oils, used oils and waste oils, mixed with sewage sludge | Klaus Kretschmar, Klaus Niemann | 1991-11-12 |
| 4983782 | Process for treating wastes and the like by low temperature carbonization and further processing of the low temperature carbonization oil | Klaus Niemann, Hans-Peter Wenning | 1991-01-08 |
| 4944866 | Process for the hydrogenation of coal | Klaus-Dieter Fuhrmann, Ulrich Graeser | 1990-07-31 |
| 4941966 | Process for the hydrogenative conversion of heavy oils and residual oils | Klaus Niemann | 1990-07-17 |
| 4851107 | Process for the hydrogenation of heavy and residual oils | Klaus Kretschmar, Klaus Niemann, Jose Guitian, Julio Krasuk, Franzo Marruffo | 1989-07-25 |
| 4639310 | Process for the production of reformer feed and heating oil or diesel oil from coal by liquid-phase hydrogenation and subsequent gas-phase hydrogenation | Werner Dohler, Heinz Frohnert, Bernd Uckermann, Ulrich Graeser, Alfons Jankowski +3 more | 1987-01-27 |