Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5828763 | Speaker system including phase shift such that the composite sound wave decreases on the principal speaker axis | Shinji Koyano, Yuichi Saito | 1998-10-27 |
| 5115883 | Loudspeaker | Hideaki Morikawa, Yasuo Gan, Takashi Ooyaba | 1992-05-26 |