Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11840982 | Quick oil return cylinder liner | Haixiao Chai | 2023-12-12 |
| 11788622 | Piston ring for engine and machining method of piston ring | — | 2023-10-17 |
| 9544671 | Speaker-box | Lei Shi, Linzhen Li | 2017-01-10 |
| 9258632 | Speaker box | — | 2016-02-09 |
| 8855355 | Micro-speaker | Lei Shi | 2014-10-07 |