Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12429321 | Tape measure with variable preformed stressed spiral spring retraction system | Shih-Chi Chou | 2025-09-30 |
| 12158338 | Tape measure with variable preformed stressed spiral spring retraction system | Shih-Chi Chou | 2024-12-03 |
| 11709044 | Tape measure with variable preformed stressed spiral spring retraction system | Shih-Chi Chou | 2023-07-25 |
| 11092418 | Tape measure with variable preformed stressed spiral spring retraction system | Shih-Chi Chou | 2021-08-17 |