Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7165768 | Variable three-dimensional labyrinth | Ying-Jen Chen | 2007-01-23 |
| D491235 | Cubic puzzle | — | 2004-06-08 |
| 6513808 | Cubic puzzle | — | 2003-02-04 |
| 6447002 | Folding collapsible luggage cart | — | 2002-09-10 |