Issued Patents 2022
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11534044 | Vacuum inlet valve assembly with a closeable seal | Darrell V. Nieschwitz, Shawn C. Metz | 2022-12-27 |
| 11484165 | Vacuum inlet valve assembly | Darrell V. Nieschwitz, Shawn C. Metz | 2022-11-01 |
| 11311158 | Central vacuum cleaning system | Cory G. Coltrin, Trevor D. Coltrin, Darrell V. Nieschwitz, Shawn C. Metz | 2022-04-26 |