Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6301355 | Method and apparatus for analyzing dual tone multi-frequency (DTMF) signals on a private branch exchange (PBX) switch | — | 2001-10-09 |
| 6167133 | Echo detection, tracking, cancellation and noise fill in real time in a communication system | Luis E. Caceres, Linda Ann Seltzer | 2000-12-26 |