Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6975811 | Optical one-to-one protection switching apparatus | Sunao Kakizaki, Hideaki Tsushima, Takashi Mori, Masahiro Takatori, Yukio Hayashi | 2005-12-13 |
| 6434286 | Optical signal switching apparatus | Yukio Hayashi, Sunao Kakizaki, Hideaki Tsushima | 2002-08-13 |
| 6334009 | Optical signal switching apparatus | Yasuyuki Fukashiro, Kenji Yamahara, Yukio Hayashi, Hideaki Tsushima | 2001-12-25 |
| 6229932 | Optical signal switching apparatus | Yasuyuki Fukashiro, Kenji Yamahara, Yukio Hayashi, Hideaki Tsushima | 2001-05-08 |