Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4763711 | Fire damper | Andrew J. Hart | 1988-08-16 |
| 4723481 | Air control damper assembly | Andrew J. Hart | 1988-02-09 |
| 4333392 | Fire damper | Andrew J. Hart | 1982-06-08 |
| 4269255 | Fire damper frames | Andrew J. Hart | 1981-05-26 |