Issued Patents 2004
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6804365 | Speaker and speaker system | Tatsuhiro Ohira, Yasuo Satoh, Kaoru Shimamura, Kunio Kosaka, Yutaka Kobayashi | 2004-10-12 |
| 6796401 | Speaker apparatus equipped with means for producing complicated waveform of low frequency with higher improved fidelity | Haruhiko Imamura | 2004-09-28 |
| 6751330 | Speaker system | Hiroshi Kowaki, Akira Nishikawa, Katsuhiko Tsumori | 2004-06-15 |
| 6724909 | Speaker apparatus | Katsuhiko Tsumori, Akira Nishikawa, Hiroshi Kowaki | 2004-04-20 |
| 6678384 | Speaker structure | Hiroshi Kowaki | 2004-01-13 |