Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4685970 | Process and apparatus for thermally treating fine-grained solids, particularly for burning ground raw material for making cement | Friedrich Fehringer | 1987-08-11 |
| 4431453 | Process and apparatus for producing hydraulic cement | Fritz Feige | 1984-02-14 |
| 4431454 | Process and apparatus for producing cement | — | 1984-02-14 |
| 4405374 | Process of producing cement and plant for carrying out the process | — | 1983-09-20 |