Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7542831 | Geographic information system and method for monitoring dynamic train positions | W. Brian Christie | 2009-06-02 |
| 7395140 | Geographic information system and method for monitoring dynamic train positions | W. Brian Christie | 2008-07-01 |