Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8566050 | Vital current sensor | — | 2013-10-22 |
| 5364047 | Automatic vehicle control and location system | William A. Petit, George G. Maderer, Samuel J. Macano | 1994-11-15 |
| 4878638 | Combination frequency loop coupling for railway track signalling | Klaus H. Frielinghaus, Frank A. Raso, Barry L. Smith | 1989-11-07 |
| 4611291 | Vital interface system for railway signalling | — | 1986-09-09 |
| 4498650 | Microprocessor based track circuit for occupancy detection and bidirectional code communication | Barry L. Smith, William A. Petit | 1985-02-12 |
| 4352475 | Audio frequency track circuit for rapid transit applications with signal modulation security | Barry L. Smith | 1982-10-05 |