| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 17 | |
| #2 | Japan | 3 |
| # | Industry | |
|---|---|---|
| #1 | Telecommunications | |
| #2 | Digital networks | |
| #3 | Environmental technology |
| # | Name | Total Patents |
|---|---|---|
| #1 | Suga Junichi | 20 |
| #2 | Nakatsugawa Keiichi | 3 |
| #3 | Saito Naoyuki | 1 |
| Publication | Filing date | Title |
|---|---|---|
| JP2017028650A | Speaker device and musical interval confirmation method | |
| JP2013012792A | Speaker device and manufacturing method therefor | |
| JP2009213104A | Speaker apparatus |