Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6739424 | Speaker system | Takashi Ogura | 2004-05-25 |
| 5025474 | Speaker system with image projection screen | Tsuneo Tanaka, Kazue Sato, Hiroyuki Takewa, Akira Kurozuka, Tadashi Tamura +6 more | 1991-06-18 |
| 4273900 | Diaphragm for acoustic equipment | Satoshi Takayama, Mitsuru Ieki | 1981-06-16 |