Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11780482 | Method, controller and track circuit for determining the relationship between a track-circuit transmitted current signal and a railway vehicle location on a railway track | Nenad Mijatovic, Jeffrey Michael Fries, Saleheh Seif, Keval Doshi | 2023-10-10 |
| 11577763 | Method and controller for determining the relationship between a track-circuit transmitted current signal and a railway vehicle location on a railway track | Nenad Mijatovic, Jeffrey Michael Fries | 2023-02-14 |
| 9751545 | Systems and methods for testing wayside units | Michael W. Steffen, II, Jeffrey Michael Fries, Aric Albert Weingartner | 2017-09-05 |
| 9340220 | Systems and methods for management of crossings near stations | Jeffrey Michael Fries, Steven Murphy, Michael W. Steffen, II, Nels Jorgensen, Anuka Sawh | 2016-05-17 |
| 9150229 | Systems and method for controlling warnings at vehicle crossings | Michael W. Steffen, II, Jeffrey Michael Fries | 2015-10-06 |
| 9026360 | Systems and methods for providing constant warning time at crossings | Jeffrey Michael Fries, Jeffrey Baker, Aric Albert Weingartner, Michael W. Steffen, II, William Shields | 2015-05-05 |