Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6016887 | Lightweight and economical sound barrier for mounting on the ground or a bridge | George R. Underhill, Gary S. Figallo | 2000-01-25 |
| 5426267 | Highway and airport sound barriers | George R. Underhill, Edward A. Landers | 1995-06-20 |