Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4785869 | Method of sizing a hot top liner and assembling a hot top | Charles B. Childs, Jr., Enn Vallak | 1988-11-22 |
| 4721278 | Lightweight reusable hot top | Enn Vallak, Charles B. Childs, Jr. | 1988-01-26 |
| 4600560 | Process for thermal insulation of the surface of a molten mass of steel and thermally insulating board used as a cover plate for carrying out said process | — | 1986-07-15 |
| 4515341 | Ingot mould having a hot-top inside the upper part of the mould | Enn Vallak | 1985-05-07 |