Issued Patents 2024
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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 |