Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4820341 | Process for producing silicon or ferrosilicon in a low-shaft electric furnace | Gert-Wilhelm Lask | 1989-04-11 |
| 4443259 | Coating for foundry cores and molds | — | 1984-04-17 |