Issued Patents All Time
Showing 1–18 of 18 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12256886 | Vacuum inlet valve assembly with sliding pins | Darrell V. Nieschwitz, Greg A. Calderone | 2025-03-25 |
| 12178382 | Central vacuum system and inlet valves therefor | Darrell V. Nieschwitz, Greg A. Calderone | 2024-12-31 |
| 12016517 | Adapter for a vacuum hose | Darrell V. Nieschwitz, Greg A. Calderone | 2024-06-25 |
| 11903553 | Vacuum hose having an integrated switch | Darrell V. Nieschwitz, Greg A. Calderone | 2024-02-20 |
| 11896187 | Central vacuum system and inlet valves therefor | Darrell V. Nieschwitz, Greg A. Calderone | 2024-02-13 |
| 11707174 | Vacuum inlet valve assembly with sliding pins | Darrell V. Nieschwitz, Greg A. Calderone | 2023-07-25 |
| 11534044 | Vacuum inlet valve assembly with a closeable seal | Darrell V. Nieschwitz, Greg A. Calderone | 2022-12-27 |
| 11484165 | Vacuum inlet valve assembly | Darrell V. Nieschwitz, Greg A. Calderone | 2022-11-01 |
| 11311158 | Central vacuum cleaning system | Cory G. Coltrin, Trevor D. Coltrin, Darrell V. Nieschwitz, Greg A. Calderone | 2022-04-26 |
| 11096534 | Central vacuum system and inlet valves therefor | Darrell V. Nieschwitz, Greg A. Calderone | 2021-08-24 |
| 11019967 | Central vacuum system and inlet valves therefor | Darrell V. Nieschwitz, Greg A. Calderone | 2021-06-01 |
| 10973382 | Central vacuum system and inlet valves therefor | Darrell V. Nieschwitz, Greg A. Calderone | 2021-04-13 |
| 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 |
| 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 |
| 9782047 | Vacuum tube locking collar | Darrell V. Nieschwitz | 2017-10-10 |
| 7945990 | Vacuum hose storage system | Andrew L. Gabric, Darrell V. Nieschwitz, James F. Smith | 2011-05-24 |