Issued Patents All Time
Showing 1–21 of 21 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5343161 | Power amplifier apparatus | Masayuki Kato | 1994-08-30 |
| 5043676 | Automatic level control circuit | Takeshi Sato, Hideo Yamamoto, Toshikazu Yoshimi, Shuichi Mori | 1991-08-27 |
| 4992749 | Pulse-width modulating amplifier circuit | Masayuki Kato, Takeshi Sato, Tatsuzo Hasegawa | 1991-02-12 |
| 4980914 | Sound field correction system | Yoshiro Kunugi, Toshikazu Yoshimi, Yoshio Sasaki, Shinjiro Kato | 1990-12-25 |
| 4968948 | Pulse width modulation amplifier circuit | Masayuki Kato, Takeshi Sato, Tatsuzo Hasegawa | 1990-11-06 |
| 4952884 | Pulse width modulation amplifier circuit | Masayuki Kato, Takeshi Sato, Tatsuzo Hasegawa | 1990-08-28 |
| 4949048 | Pulse width modulation amplifier circuit | Masayuki Kato, Takeshi Sato, Tatsuzo Hasegawa | 1990-08-14 |
| 4928071 | Limiter circuit | Hideo Yamamoto, Takeshi Sato, Toshikazu Yoshimi, Shuichi Mori | 1990-05-22 |
| 4868878 | Sound field correction system | Yoshiro Kunugi, Toshikazu Yoshimi, Yoshio Sasaki, Shinjiro Kato, Shuuichi Mori +2 more | 1989-09-19 |
| 4739513 | Method and apparatus for measuring and correcting acoustic characteristic in sound field | Yoshiro Kunugi, Shinichi Suzuki, Masayuki Kato, Toshikazu Yoshimi, Takeshi Sato | 1988-04-19 |
| 4696370 | Headrest-mounted acoustic device | Kazunori Takagi, Shuichi Mori | 1987-09-29 |
| 4694498 | Automatic sound field correcting system | Shinichi Suzuki, Yoshiro Kunugi, Masayuki Kato | 1987-09-15 |
| 4648117 | Mobile sound field correcting device | Yoshiro Kunugi, Toshikazu Yoshimi, Shinjiro Kato, Yoshio Sasaki, Makoto Odaka +1 more | 1987-03-03 |
| 4644292 | Automatic gain and frequency characteristic control unit in audio device | Yoshiro Kunugi, Makoto Odaka, Takeshi Sato, Yoshio Sasaki | 1987-02-17 |
| 4622691 | Mobile sound field correcting device | Yoshiro Kunugi, Toshikazu Yoshimi, Shinjiro Kato, Yoshio Sasaki, Makoto Odaka +1 more | 1986-11-11 |
| 4496860 | Voltage-controlled attenuator | — | 1985-01-29 |
| 4476571 | Automatic sound volume control device | Masayuki Kato | 1984-10-09 |
| 4456887 | Differential amplifier | — | 1984-06-26 |
| 4418323 | Oscillator having capacitor charged and discharged by current mirror circuits | Yoshiro Kunugi | 1983-11-29 |
| 4415863 | Pulse width modulation amplifier | — | 1983-11-15 |
| 4258329 | Noise suppression system | — | 1981-03-24 |