Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6726398 | Road sign device and spontaneously emitted light sign system used for the device | Yasuhiko Hamakawa, Yasuo Kaneko | 2004-04-27 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6726398 | Road sign device and spontaneously emitted light sign system used for the device | Yasuhiko Hamakawa, Yasuo Kaneko | 2004-04-27 |