Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8240676 | Piston ring | Hideshi Hitosugi, Makoto Tsuruta | 2012-08-14 |
| 8181968 | Piston ring | Etuo Tamegai, Hiromi Ishikawa, Makoto Tsuruta | 2012-05-22 |
| 8088496 | Piston ring | Etuo Tamegai, Hiromi Ishikawa, Makoto Tsuruta | 2012-01-03 |
| 7854191 | Three-piece oil ring and combination of the three-piece oil ring and piston | — | 2010-12-21 |