Issued Patents 1997
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5690132 | Catch-free safety umbrella | Jung-Jen Chang | 1997-11-25 |
| 5626161 | Multiple-fold automatic umbrella with simplified reliable control means | Jung-Jen Chang | 1997-05-06 |
| 5615697 | Pocketable folding umbrella with foldably sandwiched ribs | Jung-Jen Chang | 1997-04-01 |