Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4590455 | Traffic control system using timed blink signal and road marker | — | 1986-05-20 |
| 4455775 | Vandalproof street name sign | — | 1984-06-26 |
| 4371863 | Traffic-actuated control systems providing an advance signal to indicate when the direction of traffic will change | — | 1983-02-01 |
| 4200860 | Method and apparatus for signalling motorists and pedestrians when the direction of traffic will change | — | 1980-04-29 |