Issued Patents All Time
Showing 26–48 of 48 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4892832 | Filter bag for microbiological examination | Kiyotaka Omote, Masami Taki, Harutomo Oshio, Kazuo Shiraishi | 1990-01-09 |
| 4874216 | Variable-waveguide optical branching filter | Katsuyuki Utaka, Kazuo Sakai, Shigeyuki Akiba | 1989-10-17 |
| 4852108 | Wavelength tunable semiconductor laser with narrow band-pass active filter region | Katsuyuki Utaka, Kazuo Sakai | 1989-07-25 |
| 4826291 | Method for manufacturing diffraction grating | Katsuyuki Utaka, Shigeyuki Akiba | 1989-05-02 |
| 4815090 | Distributed feedback semiconductor laser with monitor | Masashi Usami, Shigeyuki Akiba, Katsuyuki Utaka | 1989-03-21 |
| 4805975 | Optical waveguide switch | Katsuyuki Utaka, Kazuo Sakai | 1989-02-21 |
| 4795225 | Semiconductor optical switch | Kazuo Sakai, Katsuyuki Utaka | 1989-01-03 |
| 4761383 | Method of manufacturing avalanche photo diode | Kazuo Sakai, Shigeyuki Akiba | 1988-08-02 |
| 4731641 | Avalanche photo diode with quantum well layer | Kazuo Sakai, Yukitoshi Kushiro, Shigeyuki Akiba, Yukio Noda, Katsuyuki Utaka | 1988-03-15 |
| 4729004 | Semiconductor photo device | Kazuo Sakai, Yukio Noda, Takaya Yamamoto | 1988-03-01 |
| 4701930 | Distributed feedback semiconductor laser | Shigeyuki Akiba, Katsuyuki Utaka, Kazuo Sakai | 1987-10-20 |
| 4682196 | Multi-layered semi-conductor photodetector | Kazuo Sakai, Shigeyuki Akiba, Katsuyuki Utaka | 1987-07-21 |
| 4665527 | Distributed feedback semiconductor laser | Shigeyuki Akiba, Katsuyuki Utaka, Kazuo Sakai | 1987-05-12 |
| 4660934 | Method for manufacturing diffraction grating | Shigeyuki Akiba, Katsuyuki Utaka, Kazuo Sakai | 1987-04-28 |
| 4653058 | Distributed feedback semiconductor laser with monitor | Shigeyuki Akiba, Katsuyuki Utaka, Kazuo Sakai | 1987-03-24 |
| 4653059 | Distributed feedback semiconductor laser | Shigeyuki Akiba, Katsuyuki Utaka, Kazuo Sakai | 1987-03-24 |
| 4648096 | Distributed feedback semiconductor laser | Shigeyuki Akiba, Katsuyuki Utaka, Kazuo Sakai | 1987-03-03 |
| 4633474 | Distributed feedback semiconductor laser | Shigeyuki Akiba, Katsuyuki Utaka, Kazuo Sakai | 1986-12-30 |
| 4589117 | Butt-jointed built-in semiconductor laser | Katsuyuki Utaka, Kazuo Sakai, Shigeyuki Akiba | 1986-05-13 |
| 4573161 | Semiconductor laser | Kazuo Sakai, Shigeyuki Akiba, Katsuyuki Utaka | 1986-02-25 |
| 4553239 | Distributed feedback semiconductor laser | Shigeyuki Akiba, Katsuyuki Utaka, Kazuo Sakai | 1985-11-12 |
| 4506367 | Distributed feedback semiconductor laser | Shigeyuki Akiba, Kazuo Sakai, Katsuyuki Utaka | 1985-03-19 |
| 4383266 | Avalanche photo diode | Kazuo Sakai, Shigeyuki Akiba, Takaya Yamamoto | 1983-05-10 |