Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4857104 | Process for reduction smelting of materials containing base metals | Charles E. O'Neill | 1989-08-15 |
| 4802916 | Copper smelting combined with slag cleaning | Carlos M. Diaz, Charles E. O'Neill, James A. Bell, Lloyd Timberg | 1989-02-07 |
| 4802917 | Copper smelting with calcareous flux | Carlos M. Diaz, Charles E. O'Neill | 1989-02-07 |