Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11372145 | Optical element and optical circuit | Takayuki Kawashima, Shojiro Kawakami, Toshikazu Ijiro | 2022-06-28 |
| 11125925 | Optical element | Shojiro Kawakami, Takayuki Kawashima, Toshikazu Ijiro, Hiroyuki Tsuda, Hiroshi Takahashi | 2021-09-21 |
| 6980707 | Waveguide type variable optical attenuator | Satoshi Takasugi, Tetsu Hasegawa, Hisato Uetsuka | 2005-12-27 |
| 6947631 | Waveguide-type optical multiplexer/demultiplexer | Hideaki Arai, Hisato Uetsuka, Masahiro Hikage | 2005-09-20 |
| 6724954 | Optical multiplexer/demultiplexer | Hideaki Arai, Hisato Uetsuka | 2004-04-20 |
| 6643427 | Waveguide-arrayed optical wavelength multiplexer/demultiplexer and fabrication method of the same | — | 2003-11-04 |
| 6631223 | Optical multiplexer/demultiplexer | Hideaki Arai, Hisato Uetsuka | 2003-10-07 |
| 6556749 | Array waveguide grating and method of manufacture thereof | Hisato Uetsuka, Masahiro Okawa, Koichi Maru | 2003-04-29 |