Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4797559 | Method and apparatus for controlling a flotation cell | Hayward B. Oblad, Michael G. Nelson | 1989-01-10 |
| 4552651 | Control of froth cell performance through the use of differential bubbler tubes | Roy O. Scandrol | 1985-11-12 |