Issued Patents All Time
Showing 1–25 of 48 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6327404 | Wavelength filter | Masayoshi Horita, Shinsuke Tanaka | 2001-12-04 |
| 6147901 | Semiconductor memory operating electrically and optically, retaining information without power supply | Haruhisa Sakata, Yasuyuki Nagao | 2000-11-14 |
| 6091536 | Optical processing device | Masashi Usami, Munefumi Tsurusawa | 2000-07-18 |
| 6084997 | Coupled waveguide structure | Katsuyuki Utaka, Shinsuke Tanaka, Masayoshi Horita | 2000-07-04 |
| 5952683 | Functional semiconductor element with avalanche multiplication | Haruhisa Sakata, Katsuyuki Utaka | 1999-09-14 |
| 5912911 | Optical short pulse reshaping device | Masashi Usami, Munefumi Tsurusawa | 1999-06-15 |
| 5859941 | Optical add/drop multiplexer device | Masayoshi Horita, Shinsuke Tanaka | 1999-01-12 |
| 5805327 | Reshaping device for optical short pulses | Masashi Usami, Munefumi Tsurusawa | 1998-09-08 |
| 5798856 | Optical pulse generator | Masatoshi Suzuki, Hideaki Tanaka | 1998-08-25 |
| 5729378 | Optical device | Hideaki Tanaka | 1998-03-17 |
| 5663572 | Optical functional semiconductor element | Haruhisa Sakata, Katsuyuki Utaka | 1997-09-02 |
| 5434693 | Optical short pulse generating device | Hideaki Tanaka, Satoru Takagi, Masatoshi Suzuki | 1995-07-18 |
| 5401957 | Optical waveform shaping device for peforming waveform equalization and timing synchronization | Masatoshi Suzuki, Noboru Edagawa, Hideaki Tanaka, Shu Yamamoto | 1995-03-28 |
| 5394260 | Optical pulse generator | Masatoshi Suzuki, Hideaki Tanaka | 1995-02-28 |
| 5392306 | Multiple quantum well structure and semiconductor device using the same | Masashi Usami | 1995-02-21 |
| 5359679 | Optical modulator | Hideaki Tanaka, Masatoshi Suzuki | 1994-10-25 |
| 5315422 | Optical Mach-Zehnder type logic element which performs an XOR operation | Katsuyuki Utaka, Yasuyuki Nagao, Kazuo Sakai | 1994-05-24 |
| 5306924 | Semiconductor device with strained-layer superlattice | Masashi Usami | 1994-04-26 |
| 5187717 | Tunable semiconductor laser | Masayoshi Horita, Katsuyuki Utaka | 1993-02-16 |
| 5132747 | Avalanche photo diode | Kazuo Sakai, Shigeyuki Akiba | 1992-07-21 |
| 5122844 | Quantum well structure and semiconductor device using the same | Shigeyuki Akiba, Masashi Usami, Kazuo Sakai, Katsuyuki Utaka | 1992-06-16 |
| 4991921 | Pn junction optical modulating device having a buffer layer with small energy gap | Masatoshi Suzuki, Hideaki Tanaka, Shigeyuki Akiba | 1991-02-12 |
| 4932034 | Distributed feedback semiconductor laser device and current injection | Masashi Usami, Shigeyuki Akiba | 1990-06-05 |
| 4918496 | Infrared emitting device with dislocation free layer | Kazuo Sakai, Shigeyuki Akiba, Katsuyuki Utaka | 1990-04-17 |
| 4897845 | Semiconductor optical amplifying element | Katsuyuki Utaka, Kazuo Sakai, Shigeyuki Akiba | 1990-01-30 |