Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10253545 | Backup power unit for powered barrier operators | Heng Liu, Brian A Strzalka | 2019-04-09 |
| 7096626 | Sash mounted housing with collapsible retainers | Liu Heng | 2006-08-29 |