Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5993514 | Process for upgrading copper sulphide residues containing nickel and iron | Derek G. E. Kerfoot, John Stiksma | 1999-11-30 |
| 5711929 | Purification of elemental sulphur | Michael E. Chalkley, Michael J. Collins, Ian M. Masters, John Stiksma | 1998-01-27 |
| 5403571 | Purification of elemental sulphur | Michael E. Chalkley, Michael J. Collins, Ian M. Masters | 1995-04-04 |