Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6647117 | Continuity of voice carried over DSL during power failure | Andrew D Wallace, Christopher Tate | 2003-11-11 |
| 6400803 | Voice over digital subscriber line call redirection for lifeline service | Christopher Tate, Jonathan Beattie, Roger James Williamson, Igor K Czajkowski | 2002-06-04 |
| 6272209 | Lifeline telephony provision for voice over digital subscriber line | Michael Grant, Roger James Williamson, Christopher Tate, Andrew D Wallace, Jeffrey G. Farrington | 2001-08-07 |