Issued Patents All Time
Showing 26–28 of 28 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5131160 | Device for measuring woodruff keyways and method of using | Heinz Proell, Dietrich Wienss | 1992-07-21 |
| 4970799 | Device for measuring a shaft keyway and method of using | Heinz Proell, Dietrich Wienss | 1990-11-20 |
| 4769053 | High efficiency sensible and latent heat exchange media with selected transfer for a total energy recovery wheel | — | 1988-09-06 |