Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 6440294 | Crust hole repair for electrolytic cells | — | 2002-08-27 | $35,434,000 |
| 4469570 | Use of a reinforced ceramic tube in the electrolytic production of metals | Laurence W. Hays | 1984-09-04 | $5,452,000 |