Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12392301 | Piston unit, top land member, and combination of piston unit parts | Hiroyuki Nagakura, Kiyoyuki Kawai | 2025-08-19 |
| 12117084 | Combination of piston rings, and combination structure of piston and piston rings | Hiroyuki Nagakura, Akira Hikone | 2024-10-15 |
| 12000491 | Combination of piston rings, and combination structure of piston and piston rings | Hiroyuki Nagakura, Akira Hikone | 2024-06-04 |