Issued Patents All Time
Showing 26–28 of 28 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8218742 | Method of correlating charging data records within an offline charging system | Yigang Cai, Chun Guang Xu, Hong Wei Sun | 2012-07-10 |
| 8139735 | IMS gateway systems and methods | Yigang Cai, Qinghong He, Ling Jiang, Ke Pei, Judith A. Stafford +3 more | 2012-03-20 |
| 7620384 | Converged service control for IMS networks and legacy networks | Yigang Cai, Xiangyang Li, Peng Wang, Rui Yun Wu, Jay Z. Zhao | 2009-11-17 |