Issued Patents 2004
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6836605 | Optical fiber preform, production method thereof, and optical fiber produced from the preform | Masaaki Hirano, Eiji Yanada | 2004-12-28 |
| 6813065 | Raman amplifier and optical communication system | Tetsufumi Tsuzaki, Motoki Kakui, Shinji Ishikawa | 2004-11-02 |
| 6791744 | Raman amplification optical fiber, optical fiber coil, raman amplifier, and optical communication system | Eisuke Sasaoka, Motoki Kakui, Toshiki Tanaka, Takao Naito | 2004-09-14 |
| 6766088 | Optical fiber and method for making the same | Takemi Hasegawa, Eisuke Sasaoka, Masayuki Nishimura | 2004-07-20 |
| 6748152 | Optical transmission system | Yuji Kubo, Takatoshi Kato | 2004-06-08 |
| 6697559 | Optical fiber and method of making the same | Masaaki Hirano, Yoshio Yokoyama | 2004-02-24 |