Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4816960 | Fail-safe output switching device | Vincent H. Littler | 1989-03-28 |
| 4768740 | Vehicle tracking system | — | 1988-09-06 |
| 4735383 | Communicating vital control signals | — | 1988-04-05 |
| 4517673 | Computer-based interlocking system | Christopher R. Brown, William G. Wilson | 1985-05-14 |
| 4494717 | Vital transmission checking apparatus for communication channels | Mark Arthur Tooley | 1985-01-22 |