Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9701327 | Current sensor for monitoring a wayside signal lamp for a positive train system | Bruce Johnson | 2017-07-11 |
| 5271584 | Pulse code railway signalling system | William A. Petit | 1993-12-21 |