Issued Patents 2011
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8018918 | Methods and apparatus for dual-tone multi-frequency signal conversion within a media over internet protocol network | Xiaomin Lu, Simon Arthur Oakley, Christopher Michael Sherwin | 2011-09-13 |
| 7983199 | Voice over internet protocol push-to-talk communication system | Bich Nguyen, Ramanathan Jagadeesan, Andrew C. Chung, Dana Blair, Ilya Slain | 2011-07-19 |