Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5328669 | Extraction of precious metals from ores and other precious metal containing materials using halogen salts | Kenneth N. Han | 1994-07-12 |
| 5308381 | Ammonia extraction of gold and silver from ores and other materials | Kenneth N. Han | 1994-05-03 |