Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6445792 | Echo canceller for decreasing a deterioration factor of a speech quality | Ikuo Kajiyama | 2002-09-03 |
| 5884194 | Hands-free telephone | — | 1999-03-16 |
| 5119423 | Signal processor for analyzing distortion of speech signals | Kunio Nakajima | 1992-06-02 |