Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8462916 | Method, system and device for playing enterprise color ringback tone | Guihua Li, Zhihong Sun, Zhibin Ren | 2013-06-11 |
| 8149998 | Method, system and device for playing enterprise color ringback tone | Guihua Li, Zhihong Sun, Zhibin Ren | 2012-04-03 |