Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11035501 | Insulated duct with air gap and method of use | John Cullen Schlageter, Donald Bradley Campbell | 2021-06-15 |
| 10767892 | Insulated flexible duct using compressible core spacer and method of use | Donald Bradley Campbell | 2020-09-08 |
| 10352482 | Insulated duct with air gap and method of use | John Cullen Schlageter, Donald Bradley Campbell | 2019-07-16 |
| 10295218 | Insulated duct with air gap and method of use | Donald Bradley Campbell | 2019-05-21 |
| 9523512 | Insulated duct with air jacket and method of use | — | 2016-12-20 |
| 9366366 | Flexible HVAC duct and method of use | Donald Bradley Campbell | 2016-06-14 |