Issued Patents All Time
| 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, Friedrich Rosenstock | 1996-01-09 |
| 5439115 | Process for selective flotation of copper-lead-zinc sulfide | Ali-Naghi Beyzavi, Leo Kitschen, Friedrich Rosenstock | 1995-08-08 |
| 5223147 | Process of treating contaminated soils | Friedrich Rosenstock, Jochen Güntner, Elmar Haite | 1993-06-29 |