Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6789491 | Friction reducing ship and method for reducing frictional resistance | Yuichi Murai | 2004-09-14 |
| 6748891 | Frictional resistance reducing method, and ship with reduced frictional resistance | — | 2004-06-15 |