Issued Patents 2002
Showing 1–2 of 2 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 |