Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4783790 | Direct-current arc furnace for steelmaking | Alexander Y. Valchev, Rumen B. Radev | 1988-11-08 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4783790 | Direct-current arc furnace for steelmaking | Alexander Y. Valchev, Rumen B. Radev | 1988-11-08 |