Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5037511 | Process for the production of pure dimethylether | Horst Dornhagen, Hartmut Hammer, Horst Schmid | 1991-08-06 |
| 4885405 | Process for the production of pure dimethylether and a catalyst used in the process | Horst Dornhagen, Hartmut Hammer, Bernd-Michael Haas | 1989-12-05 |
| 4802956 | Process for the purification of dimethylether by distillation | Horst Dornhagen, Hartmut Hammer | 1989-02-07 |
| 4494960 | Process for the production of pumpable coal slurries | Wilfried Dolkemeyer, Karl-Heinz Keim | 1985-01-22 |
| 4459273 | Carbon black obtained from aqueous suspensions | Wilfried Dolkemeyer, Kurt Erdt, Rene Hentges | 1984-07-10 |
| 4329329 | Process for obtaining carbon black from aqueous suspensions | Wilfried Dolkemeyer, Kurt Erdt, Rene Hentges | 1982-05-11 |
| 4319982 | Method of processing oil-shale or tar sand | Karl-Heinz Keim | 1982-03-16 |
| 4283571 | Process for the catalytic isomerization of o-cresol | Karl-Heinz Keim, Reinhard Kiauk | 1981-08-11 |