Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4592535 | Damper blade | David J. Gaiger | 1986-06-03 |
| 4531534 | Spring-powered actuator | David J. Gaiger, Neil Simkins | 1985-07-30 |
| 4333489 | Spring-motor dual-functioning mechanism | Donald J. Lockley, Richard J. Perrin | 1982-06-08 |
| 4304248 | Damper blade operating mechanism | — | 1981-12-08 |
| 4256143 | Shut-off damper | Sydney J. Field | 1981-03-17 |
| 4244397 | Shut-off damper | Sydney J. Field | 1981-01-13 |
| 4184288 | Smoke and fire shield damper | Sydney J. Field | 1980-01-22 |