Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6377215 | Apparatus and method for detecting railroad locomotive turns by monitoring truck orientation | David H. Halvorson | 2002-04-23 |
| 6360998 | Method and apparatus for controlling trains by determining a direction taken by a train through a railroad switch | David H. Halvorson, Stephen R. Montgomery | 2002-03-26 |
| 5950966 | Distributed positive train control system | Stephen R. Montgomery | 1999-09-14 |
| 5415369 | Railroad in-cab signaling with automatic train stop enforcement utilizing radio frequency digital transmissions | — | 1995-05-16 |