Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7387767 | Recovery of nickel, cobalt, iron, silica, zinc and copper from laterite ore by sulfuric acid leaching | Finlay Campbell, Michael J. Collins, Lyle Trytten | 2008-06-17 |
| 5711929 | Purification of elemental sulphur | Michael E. Chalkley, Michael J. Collins, Manher M. Makwana, John Stiksma | 1998-01-27 |
| 5403571 | Purification of elemental sulphur | Michael E. Chalkley, Michael J. Collins, Manher M. Makwana | 1995-04-04 |
| 5380354 | Recovery of metals from sulphidic material | Michael E. Chalkley, Barry N. Doyle | 1995-01-10 |
| 4832925 | Recovery of zinc from zinc-containing sulphidic material | Donald R. Weir, Barry N. Doyle | 1989-05-23 |
| 4545963 | Process for separately recovering zinc and lead values from zinc and lead containing sulphidic ore | Donald R. Weir, Barry N. Doyle, Michael E. Chalkley | 1985-10-08 |
| 4505744 | Recovery of zinc from zinc containing sulphidic material | Donald R. Weir, Gerald L. Bolton | 1985-03-19 |
| 4443253 | Recovery of zinc from zinc containing sulphidic materials | Donald R. Weir | 1984-04-17 |
| 4423007 | Removal of radium from aqueous sulphate solutions | Donald R. Weir, Manfred G. Neven | 1983-12-27 |
| 4406864 | Recovery of uranium from material containing iron, arsenic and siliceous matter | Donald R. Weir, Roman M. Genik-Sas-Berezowsky | 1983-09-27 |
| 4366128 | Removal of arsenic from aqueous solutions | Donald R. Weir | 1982-12-28 |
| 4272490 | Hydrometallurgical process for the treatment of ores | Verner B. Sefton | 1981-06-09 |