Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5757513 | Signal discrimination circuit | Shuuichi Yoshikawa, Yasumoto Murata | 1998-05-26 |
| 5592544 | DTMF signal judging apparatus | Yasumoto Murata, Shuichi Yoshikawa, Masahiko Watanabe | 1997-01-07 |
| 5588052 | DTMF signal judging apparatus | Yasumoto Murata, Shuichi Yoshikawa, Masahiko Watanabe | 1996-12-24 |
| 5428680 | DTMF signal receiving apparatus equipped with a DTMF signal judging circuit | Yasumoto Murata, Shuichi Yoshikawa | 1995-06-27 |
| 5343420 | Signal discrimination circuit | Yasumoto Murata, Syuuichi Yoshikawa | 1994-08-30 |
| 5068876 | Phase shift angle detector | Shuuichi Yoshikawa, Masahiko Watanabe, Yasumoto Murata, Takahiko Nakano | 1991-11-26 |