Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11498596 | Draft gear, coupler and draft gear and railway train | Huaping Yang, Hui Liu, Gengchang Xie | 2022-11-15 |
| 9545934 | Balancing apparatus for a transition coupler | Hui Liu, Shuhua Duan | 2017-01-17 |
| 6450510 | In-line roller skate having adjustable toe portion | — | 2002-09-17 |