Issued Patents 2004
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6771629 | In-band signaling for synchronization in a voice communications network | Dan Alan Preston, Joseph D. Preston | 2004-08-03 |
| 6690681 | In-band signaling for data communications over digital wireless telecommunications network | Dan Alan Preston, Joseph D. Preston, Robert Leyendecker, Wayne Eatherly | 2004-02-10 |
| 6681121 | Circuitry for activating a modem in a cellular telephone | Dan Alan Preston, Joseph D. Preston | 2004-01-20 |