Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5320720 | Extraction of precious metals from ores thereof | Alfred S. Hayden, Christopher Andrew Fleming | 1994-06-14 |
| 5256189 | Aqueous oxidation of sulfidic silver ore | Alfred S. Hayden | 1993-10-26 |