Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5757513 | Signal discrimination circuit | Michio Ikeuchi, Shuuichi Yoshikawa | 1998-05-26 |
| 5642463 | Stereophonic voice recording and playback device | Takahiko Nakano | 1997-06-24 |
| 5634085 | Signal reproducing device for reproducting voice signals with storage of initial valves for pattern generation | Shuichi Yoshikawa, Yuji Nishiwaki | 1997-05-27 |
| 5592544 | DTMF signal judging apparatus | Michio Ikeuchi, Shuichi Yoshikawa, Masahiko Watanabe | 1997-01-07 |
| 5588052 | DTMF signal judging apparatus | Michio Ikeuchi, Shuichi Yoshikawa, Masahiko Watanabe | 1996-12-24 |
| 5587977 | Recording/reproducing apparatus having means to detect the exchange of an external memory | — | 1996-12-24 |
| 5504835 | Voice reproducing device | Shuichi Yoshikawa, Takahiko Nakano | 1996-04-02 |
| 5428680 | DTMF signal receiving apparatus equipped with a DTMF signal judging circuit | Michio Ikeuchi, Shuichi Yoshikawa | 1995-06-27 |
| 5361323 | Signal encoding device | Shuichi Yoshikawa, Yuji Nishiwaki, Shuichi Kawama, Tomokazu Morio, Atsunori Kitoh | 1994-11-01 |
| 5343420 | Signal discrimination circuit | Syuuichi Yoshikawa, Michio Ikeuchi | 1994-08-30 |
| 5325463 | IC card with built-in voice synthesizing function | Shuichi Yoshikawa, Yuji Nishiwaki | 1994-06-28 |
| 5243303 | Pseudo-random noise signal generator | Shuichi Yoshikawa, Yuji Nishiwaki | 1993-09-07 |
| 5068876 | Phase shift angle detector | Shuuichi Yoshikawa, Masahiko Watanabe, Michio Ikeuchi, Takahiko Nakano | 1991-11-26 |