Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4980914 | Sound field correction system | Akio Tokumo, Toshikazu Yoshimi, Yoshio Sasaki, Shinjiro Kato | 1990-12-25 |
| 4868878 | Sound field correction system | Akio Tokumo, 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 | Shinichi Suzuki, Masayuki Kato, Akio Tokumo, Toshikazu Yoshimi, Takeshi Sato | 1988-04-19 |
| 4694498 | Automatic sound field correcting system | Shinichi Suzuki, Akio Tokumo, Masayuki Kato | 1987-09-15 |
| 4688258 | Automatic graphic equalizer | Shinichi Suzuki, Masayuki Kato | 1987-08-18 |
| 4648117 | Mobile sound field correcting device | Akio Tokumo, Toshikazu Yoshimi, Shinjiro Kato, Yoshio Sasaki, Makoto Odaka +1 more | 1987-03-03 |
| 4644292 | Automatic gain and frequency characteristic control unit in audio device | Makoto Odaka, Takeshi Sato, Yoshio Sasaki, Akio Tokumo | 1987-02-17 |
| 4637049 | Car-mounted audio system | — | 1987-01-13 |
| 4622691 | Mobile sound field correcting device | Akio Tokumo, Toshikazu Yoshimi, Shinjiro Kato, Yoshio Sasaki, Makoto Odaka +1 more | 1986-11-11 |
| 4418323 | Oscillator having capacitor charged and discharged by current mirror circuits | Akio Tokumo | 1983-11-29 |
| 4415862 | Pulse width modulation amplifier | — | 1983-11-15 |
| 4348616 | Preset lighting device | Kazuyuki Tanaka, Yoshiharu Ueki, Shozaburo Sakaguchi | 1982-09-07 |