Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8249242 | Secure call DTMF signaling | Soren K. Lundsgaard, Douglas A. Kuhlman, Yi-Cheng Liu, Edgardo L. Promenzio | 2012-08-21 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8249242 | Secure call DTMF signaling | Soren K. Lundsgaard, Douglas A. Kuhlman, Yi-Cheng Liu, Edgardo L. Promenzio | 2012-08-21 |