Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11648329 | Air purifiers | Chi Keung Chan, Ka Wai Jim | 2023-05-16 |
| 8709137 | Method and apparatus for disinfecting and deodorizing a toilet system | Chi Keung Chan, Yee Lam Chan, Ka Tung Ho | 2014-04-29 |