Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5989311 | Recovery of copper from its sulfides and other sources using halogen reagents and oxidants | Kenneth N. Han | 1999-11-23 |
| 5542957 | Recovery of platinum group metals and rhenium from materials using halogen reagents | Kenneth N. Han | 1996-08-06 |
| 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 |
| 5114687 | Ammonia extraction of gold and silver from ores and other materials | Kenneth N. Han | 1992-05-19 |