Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4813480 | Apparatus for cooling dust or finely granular bulk material | Wolfgang Haak, Bernd Kirchhoff | 1989-03-21 |
| 4799595 | Apparatus for the classifying of powdered bulk materials | — | 1989-01-24 |