Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6658020 | Voice data exchange system | Keiji Matsunuma, Yoshinori Sekine | 2003-12-02 |
| 6654455 | IP conference telephone system compatible with IP-PBX systems | — | 2003-11-25 |
| 5740373 | Packet switching system having communication control unit for sending acknowledgment to the source upon receiving the receive response data associated with the last cell | — | 1998-04-14 |