Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880458 | Start-up method for a direct reduction process without an external reformer | Enrique R. Martinez-Vera | 1989-11-14 |
| 4834792 | Method for producing hot sponge iron by introducing hydrocarbon for carburizing into reduction zone | — | 1989-05-30 |