Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7400830 | Quality monitoring method and apparatus for wavelength division multiplexed optical signal and optical transmission system using the same | Takao Naito, Hiroshi Nakamoto, Toru Katagiri | 2008-07-15 |
| 7379233 | Raman amplifier utilizing pump modulation for expanding gain band width | Hiroshi Nakamoto, Takao Naito, Toshiki Tanaka | 2008-05-27 |
| 7242519 | Raman amplifier and optical transmission system using the same | Takao Naito, Toshiki Tanaka, Masahiro Yuki | 2007-07-10 |
| 6879433 | Wavelength conversion apparatus | Shinji Yamashita | 2005-04-12 |
| 6671083 | Raman amplifier and optical transmission system | Toshiki Tanaka, Takao Naito | 2003-12-30 |
| 6518551 | Apparatus and a method for heating a protective member for an optical fiber fusion splicing part | Tsutomu Watanabe | 2003-02-11 |
| 6437299 | Heating apparatus for splice protector with separate heating conductor patterns | Tsutomu Watanabe | 2002-08-20 |
| 6393299 | Radio communication equipment | Toru Mizumoto, Hiroaki Shimizu, Tatsuya Tokunaga | 2002-05-21 |
| 6219534 | Radio communication apparatus | — | 2001-04-17 |
| 6201952 | Radio communication apparatus | Hiroaki Shimizu, Tatsuya Tokunaga, Toru Mizumoto | 2001-03-13 |
| 5444863 | Radio communication apparatus having common circuits usable by transmitter and receiver systems | — | 1995-08-22 |