Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6235547 | Semiconductor device and method of fabricating the same | Yoshiki Sakuma, Yoshihiro Sugiyama | 2001-05-22 |
| 6011271 | Semiconductor device and method of fabricating the same | Yoshiki Sakuma, Yoshihiro Sugiyama | 2000-01-04 |
| 5650611 | Light switching method, light switching apparatus and optical semiconductor device | Yuji Nishikawa, Atsushi Takeuchi | 1997-07-22 |
| 5499206 | Semiconductor optical memory device for optical storage of information with increased recording density | — | 1996-03-12 |
| 5266814 | Optically activated resonant-tunneling transistor | Tsuguo Inata | 1993-11-30 |
| 5225692 | Non-linear quantum semiconductor optical device having a signal-to-noise ratio | Atsushi Takeuchi, Hideaki Ishikawa | 1993-07-06 |
| 5216261 | Non-linear optical device having an improved rate for recovery | Tsuguo Inata | 1993-06-01 |
| 5175739 | Semiconductor optical device having a non-linear operational characteristic | Atsushi Takeuchi | 1992-12-29 |
| 5160993 | High speed optosemiconductor device having multiple quantum wells | Hideaki Ishikawa, Yoshihiro Sugiyama, Toshio Fujii | 1992-11-03 |
| 5130766 | Quantum interference type semiconductor device | Hiroshi Arimoto, Shigehiko Sasa, Makoto Okada, Naoki Yokoyama | 1992-07-14 |
| 4929984 | Resonant tunnelling barrier structure device | Tsuguo Inata, Atsushi Takeuchi, Yoshihiro Sugiyama | 1990-05-29 |
| 4825264 | Resonant tunneling semiconductor device | Tsuguo Inata, Toshio Fujii | 1989-04-25 |
| 4786957 | Negative differential resistance element | — | 1988-11-22 |