Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6877671 | Between-rails roadway for road-rail crossings | Frank Drayton Williams, Bill Wei Shiu Chien | 2005-04-12 |
| 6701594 | System for securing interface strips at road/rail crossings | — | 2004-03-09 |
| 6401318 | Apparatus for securing interface strips at road/rail crossings | — | 2002-06-11 |
| 6250562 | Resilient caps for cross-ties at railway crossings | — | 2001-06-26 |
| 5899379 | Interface strip for road/rail crossing | Frank Drayton Williams, Bill Wei Shiu Chien | 1999-05-04 |