Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5511132 | Communication device having air-borne and solid-borne transmitting and receiving devices | — | 1996-04-23 |
| 5396563 | Earphone | — | 1995-03-07 |
| 5043676 | Automatic level control circuit | Takeshi Sato, Hideo Yamamoto, Shuichi Mori, Akio Tokumo | 1991-08-27 |
| 4980914 | Sound field correction system | Yoshiro Kunugi, Akio Tokumo, Yoshio Sasaki, Shinjiro Kato | 1990-12-25 |
| 4928071 | Limiter circuit | Hideo Yamamoto, Takeshi Sato, Shuichi Mori, Akio Tokumo | 1990-05-22 |
| 4914707 | Balanced vehicular speaker system | Shinjiro Kato, Hideo Yamamoto, Takeshi Sato, Hisashi Kihara | 1990-04-03 |
| 4868878 | Sound field correction system | Yoshiro Kunugi, Akio Tokumo, 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, Akio Tokumo, Takeshi Sato | 1988-04-19 |
| 4648117 | Mobile sound field correcting device | Yoshiro Kunugi, Akio Tokumo, Shinjiro Kato, Yoshio Sasaki, Makoto Odaka +1 more | 1987-03-03 |
| 4622691 | Mobile sound field correcting device | Akio Tokumo, Yoshiro Kunugi, Shinjiro Kato, Yoshio Sasaki, Makoto Odaka +1 more | 1986-11-11 |
| 4403120 | Earphone | — | 1983-09-06 |
| 4327331 | Audio amplifier device | Hiroshi Ono | 1982-04-27 |