Issued Patents All Time
Showing 1–25 of 27 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9147997 | Optical semiconductor device | Takeshi Saito, Masakazu Takabayashi, Eitaro Ishimura, Kazuhisa Takagi, Keisuke Matsumoto +1 more | 2015-09-29 |
| 9042008 | Optical semiconductor device | Takeshi Saito, Masakazu Takabayashi, Eitaro Ishimura, Kazuhisa Takagi, Keisuke Matsumoto +1 more | 2015-05-26 |
| 8792756 | Optical semiconductor device | — | 2014-07-29 |
| 8233515 | Optical waveguide integrated semiconductor optical device | — | 2012-07-31 |
| 7835413 | Semiconductor laser | Yuichiro Okunuki, Go Sakaino | 2010-11-16 |
| 7720123 | Buried type semiconductor laser | Chikara Watatani | 2010-05-18 |
| 7675954 | Semiconductor laser device | Tomoko Kadowaki, Toshio Tanaka, Yutaka Mihashi | 2010-03-09 |
| 7504664 | Semiconductor optical device having an improved current blocking layer and manufacturing method thereof | — | 2009-03-17 |
| 7187701 | Ridge waveguide semiconductor laser | Yutaka Mihashi, Toshio Tanaka, Tomoko Kadowaki, Yoshihiko Hanamaki, Nobuyuki Tomita | 2007-03-06 |
| 6768760 | Ridge-waveguide semiconductor laser device | Yutaka Mihashi, Yoshihiko Hanamaki | 2004-07-27 |
| 6741630 | Ridge waveguide distributed feedback laser | — | 2004-05-25 |
| 6674784 | Distributed feedback laser device and method for manufacturing the same | Yoshihiko Hanamaki | 2004-01-06 |
| 6642075 | Method for manufacturing semiconductor laser device | — | 2003-11-04 |
| 6618411 | Semiconductor laser element | Kyosuke Kuramoto | 2003-09-09 |
| 6583510 | Semiconductor device with varying thickness gold electrode | Yoshihiko Hanamaki, Toshio Tanaka | 2003-06-24 |
| 6455338 | Method of manufacturing an integrated semiconductor laser-modulator device | Kazuhisa Takagi, Hitoshi Tada | 2002-09-24 |
| 6277663 | Method of producing semiconductor laser diode | Keisuke Matsumoto, Kazuhisa Takagi | 2001-08-21 |
| 6026106 | Composite optical device | Daisuke Suzuki, Tatsuya Kimura | 2000-02-15 |
| 5991322 | Semiconductor optical device | Katsuhiko Goto, Hirotaka Kizuki | 1999-11-23 |
| 5771257 | Light absorption modulator and integrated semiconductor laser and modulator | Eitaro Ishimura | 1998-06-23 |
| 5763287 | Method of fabricating semiconductor optical device | Takushi Itagaki, Yutaka Mihashi, Akira Takemoto | 1998-06-09 |
| 5671242 | Strained quantum well structure | Katsuhiko Goto | 1997-09-23 |
| 5544188 | Semiconductor laser device having a high emission efficiency and a large modulation bandwidth | Katsuhiko Goto | 1996-08-06 |
| 5459747 | Semiconductor optical devices | Katsuhiko Goto, Hirotaka Kizuki | 1995-10-17 |
| 5452383 | Optical switch and method for producing the optical switch | — | 1995-09-19 |