Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4844426 | Vertical shaft furnace for melting aluminum | David A. Barnes, John D. Butler, Robert H. McKenzie | 1989-07-04 |
| 4664702 | Method of melting aluminum in a vertical shaft furnace | David A. Barnes, John D. Butler, Robert H. McKenzie | 1987-05-12 |