Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5678353 | Grass guard | Chein-Hwa Tsao, Stephen Kwok Ki Chan | 1997-10-21 |
| 5297703 | Non-spill loading device for the loading of bottled fluid into a dispenser | Chein-Hwa Tsao | 1994-03-29 |