Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6131590 | Collapsible umbrella structure with hand protection | Jung-Jen Chang | 2000-10-17 |
| 5865200 | Collapsible umbrella with a reliable and smooth self-opening mechanism | Jung-Jen Chang | 1999-02-02 |