Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9797190 | Louver roller system with an intermittent gear turning mechanism | Yifei Zhang | 2017-10-24 |
| 9580958 | Louver roller mechanism and roller system with gear clutch turning mechanism | Yifei Zhang | 2017-02-28 |
| 9493983 | Louver roller system with cam pin turning mechanism | Yifei Zhang, Gang Gui, Huiwen Xu | 2016-11-15 |