Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4627147 | Method of constructing a refractory plate assembly for use in a sliding closure unit | — | 1986-12-09 |
| 4601416 | Closure plate and sliding closure unit | Bruno Schiltknecht, Gebhard Arnold, Robert Fricker, Beat Troxler | 1986-07-22 |