Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7434768 | Portable turnout system | John Humphrey | 2008-10-14 |
| 6854945 | Drift pin cap and method of using same | John Humphrey | 2005-02-15 |
| 6571963 | Switch heater cover support rack | John Humphrey | 2003-06-03 |
| 5582371 | Rail flange securement clamp | John Humphrey | 1996-12-10 |
| 5501418 | Switch point roller assist apparatus | John Humphrey | 1996-03-26 |