Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6304557 | Communication network configuration detecting method and communication line information table creating method | — | 2001-10-16 |
| 5826038 | Communication network configuration detecting method using frame transmission | — | 1998-10-20 |
| 5818816 | Communication device for switching connection from a working channel line to a protection channel line and vice versa | Tsutomu Chikazawa, Jun Wakabayashi, Masaaki Iwasaki | 1998-10-06 |