Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8750290 | Method and apparatus for ensuring accessibility to emergency service via VoIP or via PSTN | Frank B. Manning | 2014-06-10 |
| 8194651 | Method and apparatus for user authentication | Dean N. Panagopoulos, Douglas Raum, Tader Chang | 2012-06-05 |
| 7593389 | Distinctive dial tone for a VoIP call | — | 2009-09-22 |
| 6711238 | Parallel-connected dialing signal transmission inhibiting device for data transfer over a telephone link | Frank B. Manning | 2004-03-23 |
| 5898756 | Parallel-connected dialing signal transmission-inhibiting device for data transfer over a telephone link | Frank B. Manning | 1999-04-27 |