Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5098044 | Highway crossing control system for railroads utilizing a communications link between the train locomotive and the crossing protection equipment | William A. Petit, John W. Parker | 1992-03-24 |
| 5092544 | Highway crossing control system for railroads utilizing a communications link between the train locomotive and the crossing protection equipment | William A. Petit, John W. Parker | 1992-03-03 |
| 4528679 | Automatic counting system for passages | Klaus H. Frielinghaus | 1985-07-09 |