Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7534390 | Tuyere device for introducing gaseous media under a liquid-metal layer | Evald A. Shumaher, Edgar E. Shumaher, Renata Francki | 2009-05-19 |
| 6873641 | Method for periodically elongating an electrode for an electric arc furnace | Ewald Antonovich Schumacher | 2005-03-29 |