Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11603929 | Wire for piston ring, and manufacturing method of piston ring | Atsushi Nakazawa, Satoshi Minemura | 2023-03-14 |
| 10072755 | Combination oil ring | Noriaki Ayuzawa, Atsushi Nakazawa, Toshiyuki Shibuya | 2018-09-11 |
| 9845873 | Combination oil ring | Noriaki Ayuzawa, Atsushi Nakazawa, Toshiyuki Shibuya | 2017-12-19 |
| 9726286 | Combination oil ring | Noriaki Ayuzawa, Atsushi Nakazawa, Toshiyuki Shibuya | 2017-08-08 |
| 9458933 | Combination oil ring | Noriaki Ayuzawa, Yutaka Kitazume | 2016-10-04 |