Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8406234 | Method and apparatus for processing multiple incoming calls in a single device | Gregory G. Dykes, Miguel Ariel Wainsztein | 2013-03-26 |
| 8249242 | Secure call DTMF signaling | Soren K. Lundsgaard, Douglas A. Kuhlman, Yi-Cheng Liu, Jorge R. Lopez Danieluk | 2012-08-21 |
| 8243629 | Methods and apparatus for selecting between an ad-hoc conference mode and an infrastructure supported conference mode | Patrick Stephen, Greg Dykes, Richard Joyner, Yi-Cheng Liu | 2012-08-14 |
| 7860060 | Method and apparatus to facilitate persistence of a handed-off communication system | Ajaykumar R. Idnani, Yi-Cheng Liu, Rajendra A. Panchal | 2010-12-28 |
| 7839826 | Method and apparatus to facilitate use of a session initiation protocol instance to support on-hold session status | Ajaykumar R. Idnani, Yi-Cheng Liu, Rajendra A. Panchal | 2010-11-23 |