Issued Patents 2021
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11096534 | Central vacuum system and inlet valves therefor | Darrell V. Nieschwitz, Shawn C. Metz | 2021-08-24 |
| 11019967 | Central vacuum system and inlet valves therefor | Darrell V. Nieschwitz, Shawn C. Metz | 2021-06-01 |
| 10973382 | Central vacuum system and inlet valves therefor | Darrell V. Nieschwitz, Shawn C. Metz | 2021-04-13 |