Issued Patents 2020
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10820763 | Central vacuum system and inlet valves therefor | Darrell V. Nieschwitz, Greg A. Calderone | 2020-11-03 |
| D885000 | Hose valve assembly for vacuum cleaning device | Darrell V. Nieschwitz, Greg A. Calderone | 2020-05-19 |