Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4527779 | Metal recovery compression mechanism | David J. Roth, Ralph D. Heifner | 1985-07-09 |
| 4386956 | Metal recovery process from aluminum dross | David J. Roth, Ralph D. Heifner | 1983-06-07 |