Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4841723 | Multiple-propellant air vehicle and propulsion system | George A. Coffinberry | 1989-06-27 |
| 4811556 | Multiple-propellant air vehicle and propulsion system | George A. Coffinberry | 1989-03-14 |