Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7039044 | Method and apparatus for early detection of DTMF signals in voice transmissions over an IP network | Michael C. Whitfield, Michael J. Simpson | 2006-05-02 |
| 6961424 | Protected mechanism for DTMF relay | Jerome Vialle, Michael C. Whitfield | 2005-11-01 |
| 6934045 | Packet length indication for a facsimile system | Jerome Vialle, Michael C. Whitfield | 2005-08-23 |