Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6726218 | Compression piston ring for use in internal combustion engine | Hideo Negishi, Hideyo Iwama | 2004-04-27 |
| 6682078 | Ring groove for oil ring with coil expander of piston | Nobuyuki Murakami, Taro Itoh | 2004-01-27 |