Issued Patents 2011
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8061930 | Method of protection with massive security barriers having tie-bars in tunnels | Barclay J. Tullis, Charles Merrill | 2011-11-22 |
| 7946786 | Segmented massive security barriers having tie-bars in tunnels | Barclay J. Tullis, Charles Merrill | 2011-05-24 |