Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6705265 | Four-stroke internal combustion engine with valve resting mechanism | Hiromi Sumi | 2004-03-16 |
| 6691663 | Four-stroke internal combustion engine cylinder head | Hiromi Sumi | 2004-02-17 |