Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11047479 | Method for producing piston ring with recess | Kazuhiro Fujimura, Atsushi Chiba, Iwao Hiraishi | 2021-06-29 |
| 10514097 | Method for producing piston ring with recess | Kazuhiro Fujimura, Atsushi Chiba, Iwao Hiraishi | 2019-12-24 |
| 9464717 | Piston ring | Michihiro Ito, Iwao Hiraishi, Makoto Kajiwara, Atsushi Chiba | 2016-10-11 |