Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4848755 | Apparatus for adding liquid alloying ingredient to molten steel | Donald R. Fosnacht, John R. Knoepke | 1989-07-18 |
| 4849167 | Method and appartus for adding liquid alloying ingredient to molten steel | Donald R. Fosnacht, John R. Knoepke | 1989-07-18 |