Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4877390 | Degassification device for a screw extruder which processes plastic material | Herbert Ocker | 1989-10-31 |
| 4824256 | Co-rotating twin-screw kneaders with kneading disks | Erwin Haring, Wolfgang Worz | 1989-04-25 |