Issued Patents 2022
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11511970 | High friction and wear resistant elevator sheave liner | Xiaoyuan Chang | 2022-11-29 |
| 11407616 | Elevator belt surface protection for installation | Xiaoyuan Chang | 2022-08-09 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11511970 | High friction and wear resistant elevator sheave liner | Xiaoyuan Chang | 2022-11-29 |
| 11407616 | Elevator belt surface protection for installation | Xiaoyuan Chang | 2022-08-09 |