Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7532606 | DTMF signal transmission method and communication apparatus | Shinya Suzuki, Kimitoshi Takeuchi, Toru Yoshihara | 2009-05-12 |
| 7062033 | DTMF signal transmission method and communication apparatus | Shinya Suzuki, Kimitoshi Takeuchi, Toru Yoshihara | 2006-06-13 |
| 7050570 | DTMF signal transmission method and communication apparatus | Shinya Suzuki, Kimitoshi Takeuchi, Toru Yoshihara | 2006-05-23 |
| 6700973 | System for transmitting DTMF signal and communication equipment thereof | Shinya Suzuki, Kimitoshi Takeuchi, Toru Yoshihara | 2004-03-02 |