Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11466892 | Backdraft damper having damper blades with opposed movement linkage | Ron Chappell | 2022-10-11 |
| 10816237 | Backdraft damper having damper blades with opposed movement linkage | Ron Chappell | 2020-10-27 |
| 10514181 | Counterweighted backdraft damper blade with improved airflow profile | Ronald Chappell | 2019-12-24 |
| 10222089 | Damper with integrated blade stop | Ronald Chappell | 2019-03-05 |