Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6422250 | Wire connection device for folding umbrellas | Ching-Tsai Chen, Chen-Maan Chang | 2002-07-23 |
| 6341613 | Folding device for umbrella | Ching-Tsai Chen, Chen-Maan Chang | 2002-01-29 |
| 6311707 | Umbrella | Ching-Tsai Chen, Chen-Maan Chang | 2001-11-06 |