Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7233659 | Message playback concurrent with speakerphone operation | Vasu Iyengar, James Charles Popa | 2007-06-19 |
| 7224794 | Transmitting message playback concurrent with speakerphone operation | Vasu Iyengar, James Charles Popa | 2007-05-29 |
| 6751249 | Received-signal-strength-based swap table for frequency hopping communication system | Joseph M. Cannon, Richard L. McDowell, Jeffrey P. Grundvig, Eric John Diethorn | 2004-06-15 |
| 6608889 | Telephone having convenience feature data transfer capability | Charles W. Berthoud, Jeffrey P. Grundvig, Arupratan Gupta, Mohd Majed Hobbi, Lakshmi Narayana Jampanaboyana | 2003-08-19 |
| 6574318 | Call related information receiver to receiver transfer | Joseph M. Cannon, James A. Johanson | 2003-06-03 |
| 6366670 | Call related information receiver unit | James A. Johanson, Vasu Iyengar, James Charles Popa, Glenn A. Ehrich | 2002-04-02 |
| 6229889 | Robust signaling tone frequency measurement | Joseph M. Cannon, James A. Johanson | 2001-05-08 |
| 6038291 | Call forwarding via a 2-line phone | Joseph M. Cannon, James A. Johanson, Scott W. McLellan | 2000-03-14 |
| 5943407 | Performance enhancement of tone detection and FSK detection using hybrid echo cancellation | Vasu Iyengar, James A. Johanson, James Charles Popa, Richard M. Ubowski | 1999-08-24 |