Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874576 | Method of producing nodular cast iron | — | 1989-10-17 |
| 4867227 | Process and apparatus for inoculating cast iron | Heiner Trager, Karl-Heinz Kleemann, Dieter H. Gumbinger | 1989-09-19 |