Issued Patents All Time
Showing 26–31 of 31 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4725308 | Process for producing molten pig iron or steel pre-products | — | 1988-02-16 |
| 4708736 | Method of producing molten pig iron or steel pre-products from particulate ferrous material | Rolf Hauk | 1987-11-24 |
| 4690387 | Metallurgical plant for producing a mixed gas | Walter Rockenschaub | 1987-09-01 |
| 4588437 | Method for producing molten pig iron or steel pre-products in a melt-down gasifier | Rolf Hauk | 1986-05-13 |
| 4354826 | Process of drying and calcining bulk materials | Gerhard Kruger | 1982-10-19 |
| 4226842 | Preparation of crystalline cryolite | Friedrich Lunzer | 1980-10-07 |