Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6625178 | Virtual private line control system with improved transmission efficiency | Takashi Okumura | 2003-09-23 |
| 6507580 | Method of controlling a calling in distributed node exchange network, distributed node exchange and distributed node exchange network | Isao OISHI | 2003-01-14 |