Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4189461 | Metal leaching from concentrates using nitrogen dioxide in acids | Theodore C. Frankiewicz | 1980-02-19 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4189461 | Metal leaching from concentrates using nitrogen dioxide in acids | Theodore C. Frankiewicz | 1980-02-19 |