Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D419531 | Ground fault circuit interrupter | Cheng Wai Chun | 2000-01-25 |
| 5933063 | Ground fault circuit interrupter | Cheng Wai Chun | 1999-08-03 |
| 5394289 | Fuse opening linkage apparatus for immersion detection circuit interrupter | Kelvin Yao | 1995-02-28 |