Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6144474 | Optical transmission system including optical repeaters with selectively enabled gain equalizers contained therein and including an add/drop apparatus with a plurality of individually selectable filters | Shinichirou Harasawa, Hiroshi Nakashima | 2000-11-07 |
| 6002820 | Optical branching and insertion apparatus | — | 1999-12-14 |
| 5296957 | Optical repeater having loop-back function used in transmission system | Masaaki Takahashi, Takanori Maki, Kazuya Amaki, Katsumi Kikawa | 1994-03-22 |