Issued Patents 2004
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6819859 | Planar lightwave circuit type variable optical attenuator | Hitoshi Hatayama | 2004-11-16 |
| 6782168 | Apparatus for and method of monitoring wavelength multiplexed signal light as well as optical transmission system using the same | Hitoshi Hatayama, Masayuki Nishimura | 2004-08-24 |
| 6690872 | Silica based optical waveguide and production method therefor | Takashi Sasaki, Shigeru Hirai, Nobuhiro Akasaka, Shigeru Tanaka | 2004-02-10 |