Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6252184 | Droplet proof keyboard for notebook computer | Ching-Cheng Tsai | 2001-06-26 |
| 6169255 | Flexible membrane circuit structure for keyswitch | Ching-Cheng Tsai | 2001-01-02 |
| 6040540 | Keyswitch structure | Ching-Cheng Tsai | 2000-03-21 |