Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7283636 | Planar speaker | Takeshi Nishimura, Kenji Iizuka, Masayuki Ishiwa, Shigeo Yamaguchi, Tsutomu Yokoyama +3 more | 2007-10-16 |
| 4281223 | Electro-acoustic transducer | Masana Ugaji, Hideo Suyama, Shigenori Yamaoka, Toshinaga Endo, Akinobu Kusuhara | 1981-07-28 |
| 4275278 | Diaphragm for a loudspeaker | Mitsuru Takashima, Masana Ugaji | 1981-06-23 |
| 4210778 | Loudspeaker system with heat pipe | Hisashi Suwa | 1980-07-01 |