Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11311158 | Central vacuum cleaning system | Cory G. Coltrin, Darrell V. Nieschwitz, Greg A. Calderone, Shawn C. Metz | 2022-04-26 |
| 10405713 | Central vacuum cleaning system | Darrell V. Nieschwitz, Cory G. Coltrin, Greg A. Calderone, Shawn C. Metz | 2019-09-10 |