Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4681286 | Door anti-hijacking latch/lock mechanism with pneumatic decompression override | Royce F. Church, Leo W. Plude | 1987-07-21 |
| 4522359 | Door anti-hijacking latch/lock mechanism with pneumatic decompression override | Royce F. Church, Leo W. Plude | 1985-06-11 |