Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8059640 | Multistage switch control circuit | Masato Sakata | 2011-11-15 |
| 7433594 | Node apparatus, optical wavelength division multiplexing network, and system switching method | Noboru Takachio, Katsumi Iwatsuki | 2008-10-07 |
| 7164861 | Node apparatus, optical wavelength division multiplexing network, and system switching method | Noboru Takachio, Katsumi Iwatsuki | 2007-01-16 |
| 6157025 | Disk shaped tunable optical filter | Yoshitada Katagiri, Yoshiaki Tachikawa, Shinji Nagaoka, Fumikazu Ohira, Kazuo Aida +3 more | 2000-12-05 |
| 5696623 | UV exposure with elongated service lifetime | Nobuo Fujie, Keiji Kuroiwa, Masaki Nakamura, Kazuya Watanabe, Takashi Aruga +3 more | 1997-12-09 |
| 5617234 | Multiwavelength simultaneous monitoring circuit employing arrayed-waveguide grating | Masafumi Koga, Mitsuhiro Teshima, Ken'ichi Sato | 1997-04-01 |