Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5671348 | Non-vital turn off of vital output circuit | — | 1997-09-23 |
| 5364047 | Automatic vehicle control and location system | George G. Maderer, Samuel J. Macano, James R. Hoelscher | 1994-11-15 |
| 5271584 | Pulse code railway signalling system | Robert I. Hochman | 1993-12-21 |
| 5098044 | Highway crossing control system for railroads utilizing a communications link between the train locomotive and the crossing protection equipment | John W. Parker, Zalmai Shahbaz | 1992-03-24 |
| 5092544 | Highway crossing control system for railroads utilizing a communications link between the train locomotive and the crossing protection equipment | John W. Parker, Zalmai Shahbaz | 1992-03-03 |
| 4994969 | Automatic yard operation using a fixed block system | — | 1991-02-19 |
| 4728063 | Railway signalling system especially for broken rail detection | John H. Auer, Jr. | 1988-03-01 |
| 4711418 | Radio based railway signaling and traffic control system | John H. Aver, Jr. | 1987-12-08 |
| 4611775 | Railway track switch control apparatus | — | 1986-09-16 |
| 4498650 | Microprocessor based track circuit for occupancy detection and bidirectional code communication | Barry L. Smith, James R. Hoelscher | 1985-02-12 |
| 4451018 | Non contact isolated current detector | Barry L. Smith | 1984-05-29 |