Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8942668 | Camel service charging in IMS networks | Yigang Cai, David C. Harms, Angelica T. Remoquillo | 2015-01-27 |
| 8929256 | Third party charging for SIP sessions | Yigang Cai, Tienyu Chiu, Eric Harold Henrikson, E-Ling Lou | 2015-01-06 |
| 8289885 | Third party charging for SIP sessions | Yigang Cai, Tienyu Chiu, Eric Harold Henrikson, E-Ling Lou | 2012-10-16 |
| 7680481 | Method and apparatus for linking charging records | Richard P. Ejzak, Nick J. Mazzarella, Thomas Trayer Towle | 2010-03-16 |