Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4911359 | Apparatus for and method of recovering chimney heat | — | 1990-03-27 |
| 4699315 | Apparatus for recovering chimney heat | — | 1987-10-13 |
| 4629147 | Over-the-wing propeller | Joseph Leedan Johnson | 1986-12-16 |