Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5078342 | Failure tolerant engine mounting | Kenneth R. Langley, Derek H. C. Fox, Malcolm Short | 1992-01-07 |
| 4452567 | Rotor drive systems | Derek A. Roberts | 1984-06-05 |
| 4375906 | System for supporting a rotor in a conditions of accidental dynamic imbalance | Derek A. Roberts | 1983-03-08 |