Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6360998 | Method and apparatus for controlling trains by determining a direction taken by a train through a railroad switch | David H. Halvorson, Joe B. Hungate | 2002-03-26 |
| 5950966 | Distributed positive train control system | Joe B. Hungate | 1999-09-14 |
| 5950967 | Enhanced distributed power | — | 1999-09-14 |