Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881972 | Process for feeding heat energy into a molten metal bath | William Wells | 1989-11-21 |
| 4852858 | Charging material preheater for preheating charging material for a metallurgical smelting unit | — | 1989-08-01 |