Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9544429 | Solutions for voice over internet protocol (VoIP) 911 location services | Yinjun Zhu, Richard Dickinson, Roger S. Marshall | 2017-01-10 |
| 9467836 | Enhanced E911 location information using voice over internet protocol (VoIP) | Richard Dickinson, Roger S. Marshall | 2016-10-11 |
| 9237228 | Solutions for voice over internet protocol (VoIP) 911 location services | Yinjun Zhu, Richard Dickinson, Roger S. Marshall | 2016-01-12 |
| 8873718 | Enhanced E911 location information using voice over internet protocol (VoIP) | Richard Dickinson, Roger S. Marshall | 2014-10-28 |
| 8798572 | Solutions for voice over internet protocol (VoIP) 911 location services | Yinjun Zhu, Richard Dickinson, Roger S. Marshall | 2014-08-05 |
| 8385881 | Solutions for voice over internet protocol (VoIP) 911 location services | Yinjun Zhu, Richard Dickinson, Roger S. Marshall | 2013-02-26 |
| 7912446 | Solutions for voice over internet protocol (VoIP) 911 location services | Yinjun Zhu, Richard Dickinson, Roger S. Marshall | 2011-03-22 |
| 7903791 | Enhanced E911 location information using voice over internet protocol (VoIP) | Richard Dickinson, Roger S. Marshall | 2011-03-08 |
| 7260186 | Solutions for voice over internet protocol (VoIP) 911 location services | Yinjun Zhu, Richard Dickinson, Roger S. Marshall | 2007-08-21 |
| 6940950 | Enhanced E911 location information using voice over internet protocol (VoIP) | Richard Dickinson, Roger S. Marshall | 2005-09-06 |