Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5348713 | Recovery of metal values from zinc plant residues | Michael J. Collins, Michael E. Chalkley | 1994-09-20 |
| 4594102 | Recovery of cobalt and nickel from sulphidic material | Donald R. Weir, Michael E. Chalkley | 1986-06-10 |