Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7586845 | Button telephone apparatus and voice communication channel control method | — | 2009-09-08 |
| 7551601 | Wireless network service provision method and wireless network system | Yoshikazu Kobayashi | 2009-06-23 |