Issued Patents 2022
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11448317 | Side rail | Yasuhiro Iwata, Hiroshi Shimizu | 2022-09-20 |
| 11333245 | Oil control ring and spacer expander | Hiroshi Shimizu, Satoshi Koizumi, Kenichi Sudou, Shigeru Tokunaga | 2022-05-17 |