Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5850970 | Prefabricated embedded railway track system | William K. Hull | 1998-12-22 |
| 5655711 | Prefabricated embedded railway track system | William K. Hull | 1997-08-12 |
| 5577662 | Embedded railway track system | William K. Hull | 1996-11-26 |
| 5535947 | Embedded railway track system | William K. Hull | 1996-07-16 |