Issued Patents All Time
Showing 26–36 of 36 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7912446 | Solutions for voice over internet protocol (VoIP) 911 location services | Yinjun Zhu, Roger S. Marshall, Steven P. Helme | 2011-03-22 |
| 7903791 | Enhanced E911 location information using voice over internet protocol (VoIP) | Roger S. Marshall, Steven P. Helme | 2011-03-08 |
| 7260186 | Solutions for voice over internet protocol (VoIP) 911 location services | Yinjun Zhu, Roger S. Marshall, Steven P. Helme | 2007-08-21 |
| 6940950 | Enhanced E911 location information using voice over internet protocol (VoIP) | Roger S. Marshall, Steven P. Helme | 2005-09-06 |
| D495614 | Notched edge carpenter square design | — | 2004-09-07 |
| D479879 | Light-irradiating sample analyzer | — | 2003-09-23 |
| D469072 | Multimedia communications device | — | 2003-01-21 |
| D313421 | Microscope | — | 1991-01-01 |
| D277484 | Computer | — | 1985-02-05 |
| D272349 | Computer | — | 1984-01-24 |
| D266848 | Computer | — | 1982-11-09 |