Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4861368 | Method for producing iron | Karl Brotzmann, Richard E. Turner, deceased | 1989-08-29 |
| 4849015 | Method for two-stage melt reduction of iron ore | Hans-Georg Fassbinder, Trenna R. Turner | 1989-07-18 |