Issued Patents 2011
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8050931 | Sound masking system and masking sound generation method | Yasushi Shimizu, Akira Miki, Masato Hata | 2011-11-01 |
| 7995768 | Sound reinforcement system | Akira Miki | 2011-08-09 |