Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE33313 | Method for making low alpha count lead | John A. Dunlop, Robert W. Smyth | 1990-08-28 |
| 4915802 | Method for making low alpha count lead | John A. Dunlop, Edward F. G. Milner, Robert W. Smyth | 1990-04-10 |
| 4887492 | Method for making low alpha count lead | John A. Dunlop, Edward F. G. Milner, Robert W. Smyth | 1989-12-19 |
| 4820340 | Method for slag fuming and reduction | Gregory G. Richards, Steven L. Cockcroft, James K. Brimacombe | 1989-04-11 |
| 4770698 | Method for making low alpha count lead | John A. Dunlop, Robert W. Smyth | 1988-09-13 |