Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6308444 | Light illuminated display board and lampshade using light refraction and reflection effect of transparent acrylic plastic plates | — | 2001-10-30 |
| 5124890 | Display board illuminated by refracted light | Hang J. Choi | 1992-06-23 |