Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10167982 | Stacked duct assemblies | Dennis W. Johnson, James H. Brown, Fred Smith, Brad Smoak | 2019-01-01 |
| 9702494 | Duct assemblies with internally bolted expansion joint | Dennis W. Johnson, James H. Brown, Fred Smith, Bradley D. Smoak | 2017-07-11 |