Issued Patents All Time
Showing 1–15 of 15 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6440194 | Recovery of precious metals from metal alloys produced aluminothermically from base metal smelter slag | Roberto Berardi | 2002-08-27 |
| 6231767 | Treatment of phosphatic wastes | Roberto Berardi | 2001-05-15 |
| 6033467 | Method of making cement or mine backfill from base metal smelter slag | — | 2000-03-07 |
| 6026965 | Process for recovering mineral particles, metal particles or small precious stones from an aqueous slim associated with an ore body or mineral deposit or processing thereof | Roberto Berardi, Peter Howe, David M. Howe | 2000-02-22 |
| 5968258 | Method of making cement from base metal smelter slag | — | 1999-10-19 |
| 5893463 | Recovering precious metals and small precious stones from clay suspensions | Peter Howe, David M. Howe | 1999-04-13 |
| 5865872 | Method of recovering metals and producing a secondary slag from base metal smelter slag | Werner Dresler | 1999-02-02 |
| 5749962 | Method of making cement from base metal smelter slag | — | 1998-05-12 |
| 5626646 | Method of recovering metals and producing a secondary slag from base metal smelter slag | — | 1997-05-06 |
| 5593493 | Method of making concrete from base metal smelter slag | — | 1997-01-14 |
| 5573576 | Method of treating steel mill waste | — | 1996-11-12 |
| 5439505 | Treatment of steel mill waste for recycling | — | 1995-08-08 |
| 4279635 | Process for treating phosphatic clay suspensions | — | 1981-07-21 |
| 4229295 | Solidification of aqueous sludge | — | 1980-10-21 |
| 4216012 | Process for the treatment of incinerated sewage sludge ash | — | 1980-08-05 |