Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5796850 | Noise reduction circuit, noise reduction apparatus, and noise reduction method | Mutsumi Yoshinaga | 1998-08-18 |
| 5734987 | Noise-controlled communication apparatus | Koji Higuchi, Noriyo Sasaoka | 1998-03-31 |
| 5721771 | Hands-free speaking device with echo canceler | Koji Higuchi | 1998-02-24 |
| 5559880 | Circuit for hands free talking | — | 1996-09-24 |