Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4876079 | Separation of a mixture of sulfur and alkaline solution and apparatus therefor | Erhard Kliem, Guenter Weber | 1989-10-24 |
| 4826324 | Kneader-mixer | Heinz List, Jorg List | 1989-05-02 |