Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6665380 | Inmate messaging system and method | Richard E. Cree | 2003-12-16 |
| 5805685 | Three way call detection by counting signal characteristics | — | 1998-09-08 |
| 5796811 | Three way call detection | — | 1998-08-18 |