Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4542907 | Corrugated expander for piston ring assembly | Yoshiaki Wada, Hiroshi Miida, Sumio Ono | 1985-09-24 |
| 4429885 | Spacer and expander member for holding and biasing piston ring rails | Hajime Yamauchi, Yoneo Kawauchi, Yukio Ikeda | 1984-02-07 |