Issued Patents 2019
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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 |