Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6656247 | Selective precipitation of manganese from magnesium-containing solutions | John Stiksma | 2003-12-02 |
| 6231823 | Solvent extraction process for the separation of cobalt from nickel in aqueous sulphate-containing solutions | Felix Petrus De Kock, Rein Raudsepp | 2001-05-15 |
| 4632701 | Process for the recovery of silver from a residue essentially free of elemental sulphur | Donald R. Weir | 1986-12-30 |
| 4610724 | Recovery of gold from refractory auriferous iron-containing sulphidic material | Donald R. Weir | 1986-09-09 |
| 4606766 | Process for separately recovering gold and silver from solution by carbon adsorption | Donald R. Weir | 1986-08-19 |
| 4571264 | Recovery of gold from refractory auriferous iron-containing sulphidic ore | Donald R. Weir | 1986-02-18 |
| 4571263 | Recovery of gold from refractory auriferous iron-containing sulphidic concentrates | Donald R. Weir | 1986-02-18 |
| 4406864 | Recovery of uranium from material containing iron, arsenic and siliceous matter | Donald R. Weir, Ian M. Masters | 1983-09-27 |
| 4405566 | Removal of uranium from sulphate solutions containing molybdenum | Donald R. Weir | 1983-09-20 |
| 4222999 | Removal of selenium from sulphate solutions | Donald R. Weir, Eva A. Vosahlo | 1980-09-16 |
| 4193970 | Process for the precipitation of iron as jarosite | Verner B. Sefton, Godefridus M. Swinkels, Charles R. Kirby | 1980-03-18 |