Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5482535 | Process for the recovery of silver by floatation from the residue from the wet extraction of zinc | Ali-Nagi Beyzavi, Horst Dittmann | 1996-01-09 |
| 5439115 | Process for selective flotation of copper-lead-zinc sulfide | Ali-Naghi Beyzavi, Leo Kitschen, Horst Dittmann | 1995-08-08 |
| 5223147 | Process of treating contaminated soils | Jochen Güntner, Elmar Haite, Horst Dittmann | 1993-06-29 |
| 5094012 | Process for decontaminating contaminated soils | Jochen Güntner, Elmar Haite | 1992-03-10 |
| 4969775 | Process of dressing contaminated soils | Fred Cappel, Dirk Hankel, Heinrich Meiler | 1990-11-13 |
| 4268304 | Direct reduction process in a rotary kiln | Harry Serbent, Gunter Kotzschke | 1981-05-19 |