Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5181679 | Railway train speed restriction apparatus | Steven Ferrarese | 1993-01-26 |
| 5168257 | Four terminal safety resistor | — | 1992-12-01 |
| 5045787 | Apparatus and method for measuring insulated track joint resistances | John H. Auer, Jr. | 1991-09-03 |
| 5010310 | Alternating current immunized relay and method of immunizing a relay to alternating current | — | 1991-04-23 |
| 4886226 | Broken rail and/or broken rail joint bar detection | — | 1989-12-12 |
| 4878638 | Combination frequency loop coupling for railway track signalling | James R. Hoelscher, Frank A. Raso, Barry L. Smith | 1989-11-07 |
| 4630792 | Railway wheel detector | — | 1986-12-23 |
| 4570882 | Vital track circuit wheel detector | — | 1986-02-18 |
| 4528679 | Automatic counting system for passages | Zalmai Shahbaz | 1985-07-09 |
| 4351504 | Track circuit principle wheel detector | — | 1982-09-28 |