Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7050232 | Optical circulator and optical switch | Shusuke Wada, Shohei Abe, Hiroaki Ono, Tsugio Tokumasu | 2006-05-23 |
| 5521741 | Polarization plane switch and optical switching device using the same | Hiromitsu Umezawa, Yoichi Suzuki, Tsugio Tokumasu, Hiroshi Rikukawa | 1996-05-28 |