Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5045787 | Apparatus and method for measuring insulated track joint resistances | Klaus H. Frielinghaus | 1991-09-03 |
| 4728063 | Railway signalling system especially for broken rail detection | William A. Petit | 1988-03-01 |
| 4617662 | Vital message system with unique function identification | Henry C. Sibley, Leslie C. Stewart | 1986-10-14 |
| 4402034 | Polarity sensitive solid state relay | John W. Parker | 1983-08-30 |
| 4316652 | Phantom eliminator for signal lights | David Birnbaum | 1982-02-23 |
| 4219837 | Alarms between stations with relative motion | Mark H. Sluis | 1980-08-26 |
| 4196412 | Driver alert system | Mark H. Sluis, Carl G. Shook, Robert F. Anderson, David Rutherford | 1980-04-01 |