Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7366657 | Voice signal processing system mounted with echo canceller and voice signal processing method | Kazuhiko Koyama | 2008-04-29 |
| 6088372 | Time division multiplexing system for digital exchange | — | 2000-07-11 |