Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6193941 | Process for producing a metallurgical raw material from oil containing heavy metals | Heinz Keller | 2001-02-27 |
| 5053210 | Method for the purification of flue gases | Friedrich-Wilhelm Pietzarka, Horst Thieme, Manfred Koch | 1991-10-01 |