Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886437 | Bearing arrangement of an external-axial rotary piston blower | — | 1989-12-12 |
| 4846642 | Rotary piston blower with foamed synthetic material surfaces running along roughened metal surfaces | Roland Nuber, Wolfgang Sohler | 1989-07-11 |
| 4797078 | Bearing arrangement of an external-axial rotary piston blower | — | 1989-01-10 |