Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4756474 | Duct pressure powered air volume controller | Richard C. Dreibelbis | 1988-07-12 |
| 4324358 | Minimum airflow control | Richard R. Lavassaur | 1982-04-13 |
| 4312474 | Positive shutoff | — | 1982-01-26 |