Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4783790 | Direct-current arc furnace for steelmaking | Alexander Y. Valchev, German I. Germanov | 1988-11-08 |
| 4740990 | Graphite electrode with protective coating and method for its production | Alexander Y. Vulchev, Vasil G. Peev | 1988-04-26 |