Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10619739 | Piston ring | Hiroyuki Sugiura | 2020-04-14 |
| 10578214 | Piston ring and manufacturing method therefor | Hiroyuki Sugiura | 2020-03-03 |
| 10087513 | Piston ring and manufacturing method therefor | Hiroyuki Sugiura | 2018-10-02 |
| 9863534 | Hard carbon coating film | Hiroyuki Sugiura | 2018-01-09 |
| 9688293 | Method and device for steering truck of railway vehicle, and truck | Kazunori Iwato, Satoshi Kikko, Satoshi Tokunaga | 2017-06-27 |