Issued Patents 2021
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11047479 | Method for producing piston ring with recess | Atsushi Chiba, Naoyuki Akimoto, Iwao Hiraishi | 2021-06-29 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11047479 | Method for producing piston ring with recess | Atsushi Chiba, Naoyuki Akimoto, Iwao Hiraishi | 2021-06-29 |