Issued Patents All Time
Showing 26–43 of 43 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6454172 | IC card having a display for displaying a response state | Hiroyuki Maeda | 2002-09-24 |
| 6266425 | Audio amplifier circuit and audio device using the circuit | Takemi Irokawa | 2001-07-24 |
| 6025824 | Piezoelectric transformer driving circuit and cold cathode tube illuminating device using the same | Sachito Horiuchi, Eiji Nakagawa, Shingo Kawashima | 2000-02-15 |
| 5812028 | Audio signal amplifier circuit and a portable acoustic apparatus using the same | Kengo Adachi, Masato Kobayashi | 1998-09-22 |
| 5808458 | Regulated power supply circuit | Sachito Horiuchi, Kengo Adachi | 1998-09-15 |
| 5787182 | Audio signal amplifier circuit and a portable audio equipment using the same | Taichi Hoshino, Isao Yamamoto, Masato Kobayashi | 1998-07-28 |
| 5770973 | Semiconductor device for amplifying audio signals | Eiji Nakagawa, Sachito Horiuchi | 1998-06-23 |
| 5508658 | Power amplifier circuit for audio signal and audio device using the same | Kei Nishioka | 1996-04-16 |
| 5483197 | Power amplifier circuit for audio signal and audio device using the same | Kei Nishioka, Katsumi Kusaba | 1996-01-09 |
| 5479134 | Power amplifier circuit for audio signal and audio device using the same | Kei Nishioka, Katsumi Kusaba | 1995-12-26 |
| 5450036 | Power amplifier circuit for audio signal and audio device using the same | Kei Nishioka | 1995-09-12 |
| 5424684 | Power amplifier circuit for audio signal and audio device using the same | Kei Nishioka | 1995-06-13 |
| 5325440 | Loudness control circuit | Hiroshi Kojima | 1994-06-28 |
| 5196807 | Amplifying circuit | — | 1993-03-23 |
| 5160897 | Push-pull power amplifying circuit | Kenichi Kokubo | 1992-11-03 |
| 5140281 | Amplifier circuit | Hiroshi Kojima | 1992-08-18 |
| 5087890 | Amplifier circuit | Kazuhisa Ishiguro | 1992-02-11 |
| 4801889 | Amplifier for amplifying input signal voltage and supplying the same | — | 1989-01-31 |