Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5711929 | Purification of elemental sulphur | Michael J. Collins, Manher M. Makwana, Ian M. Masters, John Stiksma | 1998-01-27 |
| 5403571 | Purification of elemental sulphur | Michael J. Collins, Manher M. Makwana, Ian M. Masters | 1995-04-04 |
| 5380354 | Recovery of metals from sulphidic material | Ian M. Masters, Barry N. Doyle | 1995-01-10 |
| 5348713 | Recovery of metal values from zinc plant residues | Derek E. Kerfoot, Michael J. Collins | 1994-09-20 |
| 4594102 | Recovery of cobalt and nickel from sulphidic material | Donald R. Weir, Derek E. Kerfoot | 1986-06-10 |
| 4545963 | Process for separately recovering zinc and lead values from zinc and lead containing sulphidic ore | Donald R. Weir, Ian M. Masters, Barry N. Doyle | 1985-10-08 |