Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4397689 | Process for the extraction of precious metals from concentrates thereof | Richard K. Lea, Julian Edwards | 1983-08-09 |
| 4390366 | Process for the extraction of precious metals from solutions thereof | Richard K. Lea, Julian Edwards | 1983-06-28 |