Issued Patents 1997
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5667296 | Water-tight Christmas tree light | Tzu-Ling Cheng | 1997-09-16 |
| 5660560 | Water-tight lamp socket | Tzu-Ling Cheng | 1997-08-26 |
| 5590952 | Lamp assembly for Christmas tree light sets | Tzu-Ling Cheng | 1997-01-07 |