Issued Patents 2017
Showing 1–2 of 2 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 |