Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5697796 | Contact sleeve | Haiderali Harji, Werner Eckhardt | 1997-12-16 |
| 5061893 | Mounting for the rotary magnet of a rotary magnet-ratio meter | — | 1991-10-29 |
| 4698188 | Evaporation air humidifier | — | 1987-10-06 |
| 4627862 | Air cleaning apparatus | Roland Frei | 1986-12-09 |