Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8379633 | Concentrator for speech telephones and method of communication over LAN using same | Shinji Usuba, Yoshinori Sekine | 2013-02-19 |
| 7561538 | Concentrator for speech telephones and method of communication over LAN using same | Shinji Usuba, Yoshinori Sekine | 2009-07-14 |
| 7382766 | Line concentrator for telephone set and communication method of LAN | Shinji Usuba, Yoshinori Sekine | 2008-06-03 |