Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4863363 | Throttling device for a twin-shaft srew-type extruder | — | 1989-09-05 |
| 4824256 | Co-rotating twin-screw kneaders with kneading disks | Gerhard Weihrich, Wolfgang Worz | 1989-04-25 |