Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4728437 | Treatment and disposal of wastewaters containing carbon black and ash | Hans Gettert, Knut Kaempfer, Bruno Sander, Siegfried Marquardt | 1988-03-01 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4728437 | Treatment and disposal of wastewaters containing carbon black and ash | Hans Gettert, Knut Kaempfer, Bruno Sander, Siegfried Marquardt | 1988-03-01 |