Issued Patents 2019
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10433690 | Central vacuum system and inlet valves therefor | Darrell V. Nieschwitz, Greg A. Calderone | 2019-10-08 |
| 10405713 | Central vacuum cleaning system | Trevor D. Coltrin, Darrell V. Nieschwitz, Cory G. Coltrin, Greg A. Calderone | 2019-09-10 |