Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9832321 | Method for collect call service based on voip technology and system thereof | — | 2017-11-28 |
| 8477766 | Method for collect call service based on VoIP technology and system thereof | — | 2013-07-02 |
| 7876744 | Method for collect call service based on VoIP technology and system thereof | — | 2011-01-25 |