Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9500248 | Elastomeric line damper | Johannes Beckert | 2016-11-22 |
| 7601297 | Fragrance dispensing device | Hans Gygax | 2009-10-13 |
| 6082973 | Liquid ring machine having a rotor with sweeping edges for scraping-off deposits | Rudi Dittmar | 2000-07-04 |
| 5350274 | Self-cleaning side channel machine having at least one impeller rotatably mounted in the housing of the machine | Norbert Aust | 1994-09-27 |
| 5299916 | Liquid-ring pump having an outlet means including a noise reducing flexible membrane | — | 1994-04-05 |
| D293277 | Shoe tree | — | 1987-12-22 |
| 4657487 | Vacuum generating apparatus including liquid ring pump, pre-separator, two heat exchangers and fine separator | Siegfried Schonwald, Hans-Georg Trojahn | 1987-04-14 |
| 4610602 | Rotary gas compressor | Siegfried Schonwald | 1986-09-09 |
| 4565498 | Rotary gas compressor | Siegfried Schonwald | 1986-01-21 |
| 4443158 | Liquid ring pump with a control disk arranged between the impeller housing and the cover | Benedikt Bentele, Siegfried Schonwald | 1984-04-17 |
| 4204802 | Side channel compressor | Siegfried Schonwald | 1980-05-27 |