Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4428769 | Process for injecting a reducing agent including ash-bearing bituminous coal into the hearth of a blast furnace | Dietrich Boecker | 1984-01-31 |
| 4402275 | Process for the continuous blowing of fine-particled reducing agents consisting predominantly of mineral coal into a shaft furnace | Antoine Weiner, Fernand Artois | 1983-09-06 |
| 4266968 | Process for injecting brown coal into a blast furnace | Heinz G. Daldrup, Gunther Nothhelfer, Friedrich H. Franke | 1981-05-12 |