Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4858894 | Stirring block with unidirectional grain structure having improved erosion resistance | — | 1989-08-22 |
| 4854553 | Self shielding lance | — | 1989-08-08 |
| 4840354 | Stirring brick with shaped gas volume control openings | — | 1989-06-20 |
| 4840355 | Slag controlling device for basic oxygen furnaces | — | 1989-06-20 |