Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4669242 | Apparatus for lining furnace walls | Steven Louis Johnson, Martin E. Adams, James P. Leffingwell, William H. Hedges, Thomas L. Robberts | 1987-06-02 |
| 4413572 | Adjustable support assembly for open hearth furnace | — | 1983-11-08 |
| 4286529 | Combination hanger and expansion plate for electric furnace roof | — | 1981-09-01 |