Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7028911 | Methods and systems for encoding and decoding data in 2D symbology | Wai Cheung, Zhi-guo Chang, Ying-feng Lv | 2006-04-18 |
| 6802450 | Guiding a scanning device to decode 2D symbols | Wai Cheung, Zhi-guo Chang, Ying-feng Lv | 2004-10-12 |