Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8031708 | Methods and apparatus for dual-tone multi-frequency signal analysis within a media over internet protocol network | Xiaomin Lu, Bruce Mattie, Christopher Michael Sherwin, David E. Sturtevant | 2011-10-04 |
| 8018918 | Methods and apparatus for dual-tone multi-frequency signal conversion within a media over internet protocol network | Rakendu Devdhar, Xiaomin Lu, Christopher Michael Sherwin | 2011-09-13 |
| 7945663 | Systems, methods, and computer program products for adaptively adjusting a registration interval of an endpoint | Subhra Saha | 2011-05-17 |