Issued Patents All Time
Showing 1–9 of 9 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 |
| 6643431 | Optical device and control method thereof | Hitoshi Hatayama, Masayuki Nishimura, Makoto Katayama | 2003-11-04 |
| 6560381 | Optical filter | Hitoshi Hatayama, Masayuki Nishimura | 2003-05-06 |
| 5693116 | Process for producing optical waveguide | Hiroo Kanamori, Yuji Matsuura | 1997-12-02 |
| 5556442 | Method for fabricating an optical waveguide | Hiroo Kanamori, Akira Urano, Haruhiko Aikawa, Shinji Ishikawa, Masahide Saito | 1996-09-17 |
| 5551966 | Optical waveguide and method of fabricating the same | Hiroo Kanamori, Akira Urano, Shinji Ishikawa, Haruhiko Aikawa, Masahide Saito | 1996-09-03 |
| 5385594 | Method for fabricating an optical waveguide | Hiroo Kanamori, Akira Urano, Haruhiko Aikawa, Shinji Ishikawa, Masahide Saito | 1995-01-31 |