Issued Patents 1994
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5362217 | Helical positive-displacement machine having a meandering sealing strip groove | Gregor Jetzer, Fritz Spinnler | 1994-11-08 |
| 5322426 | Displacement machine spiral shaped strip with different curvatures | — | 1994-06-21 |
| 5318425 | Displacement machine according to the spiral principle | Gregor Jetzer, Fritz Spinnler | 1994-06-07 |