Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8490567 | Apparatus for coupling a pushboat to a barge | Takuma Yamaguchi, Robert P. Hill | 2013-07-23 |
| 5050522 | Apparatus for connecting a pusher boat and a barge | Takuma Yamaguchi | 1991-09-24 |