Issued Patents All Time
Showing 51–75 of 79 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874216 | Variable-waveguide optical branching filter | Katsuyuki Utaka, Yuichi Matsushima, Shigeyuki Akiba | 1989-10-17 |
| 4852108 | Wavelength tunable semiconductor laser with narrow band-pass active filter region | Katsuyuki Utaka, Yuichi Matsushima | 1989-07-25 |
| 4805975 | Optical waveguide switch | Katsuyuki Utaka, Yuichi Matsushima | 1989-02-21 |
| 4795225 | Semiconductor optical switch | Yuichi Matsushima, Katsuyuki Utaka | 1989-01-03 |
| 4761383 | Method of manufacturing avalanche photo diode | Yuichi Matsushima, Shigeyuki Akiba | 1988-08-02 |
| 4750550 | Method for the transfer of heat energy | Masaki Ikematsu, Eiichi Yoshida | 1988-06-14 |
| 4742414 | Rotary magnetic head device for magnetic recording/reproduction apparatus | Takao Terayama, Teizo Tamura | 1988-05-03 |
| 4731641 | Avalanche photo diode with quantum well layer | Yuichi Matsushima, Yukitoshi Kushiro, Shigeyuki Akiba, Yukio Noda, Katsuyuki Utaka | 1988-03-15 |
| 4729004 | Semiconductor photo device | Yuichi Matsushima, Yukio Noda, Takaya Yamamoto | 1988-03-01 |
| 4701930 | Distributed feedback semiconductor laser | Shigeyuki Akiba, Katsuyuki Utaka, Yuichi Matsushima | 1987-10-20 |
| 4682196 | Multi-layered semi-conductor photodetector | Yuichi Matsushima, Shigeyuki Akiba, Katsuyuki Utaka | 1987-07-21 |
| 4665527 | Distributed feedback semiconductor laser | Shigeyuki Akiba, Katsuyuki Utaka, Yuichi Matsushima | 1987-05-12 |
| 4660934 | Method for manufacturing diffraction grating | Shigeyuki Akiba, Katsuyuki Utaka, Yuichi Matsushima | 1987-04-28 |
| 4653058 | Distributed feedback semiconductor laser with monitor | Shigeyuki Akiba, Katsuyuki Utaka, Yuichi Matsushima | 1987-03-24 |
| 4653059 | Distributed feedback semiconductor laser | Shigeyuki Akiba, Katsuyuki Utaka, Yuichi Matsushima | 1987-03-24 |
| 4648096 | Distributed feedback semiconductor laser | Shigeyuki Akiba, Katsuyuki Utaka, Yuichi Matsushima | 1987-03-03 |
| 4633474 | Distributed feedback semiconductor laser | Shigeyuki Akiba, Katsuyuki Utaka, Yuichi Matsushima | 1986-12-30 |
| 4589117 | Butt-jointed built-in semiconductor laser | Katsuyuki Utaka, Shigeyuki Akiba, Yuichi Matsushima | 1986-05-13 |
| 4573161 | Semiconductor laser | Yuichi Matsushima, Shigeyuki Akiba, Katsuyuki Utaka | 1986-02-25 |
| 4573158 | Distributed feedback semiconductor laser | Katsuyuki Utaka, Shigeyuki Akiba | 1986-02-25 |
| 4553239 | Distributed feedback semiconductor laser | Shigeyuki Akiba, Katsuyuki Utaka, Yuichi Matsushima | 1985-11-12 |
| 4525269 | Process for the solvent deasphalting of asphaltene-containing hydrocarbons | Masaki Ikematsu, Isao Honzyo | 1985-06-25 |
| 4516243 | Distributed feedback semiconductor laser | Katsuyuki Utaka, Shigeyuki Akiba | 1985-05-07 |
| 4514287 | Process for the solvent deasphalting of asphaltene-containing hydrocarbons | Masaki Ikematsu, Isao Honzyo | 1985-04-30 |
| 4506367 | Distributed feedback semiconductor laser | Shigeyuki Akiba, Katsuyuki Utaka, Yuichi Matsushima | 1985-03-19 |