Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7107876 | Ratchet type screwdriver | — | 2006-09-19 |
| 6237447 | One-way driving control mechanism of a wrench | Shiou-Yih Chen | 2001-05-29 |
| 5960680 | Ratchet wrench | Shiou-Yih Chen | 1999-10-05 |