Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5467213 | Optical trunk transmission system and an optical repeater circuit | Isamu Takano | 1995-11-14 |
| 5392147 | Optical trunk transmission system and an optical repeater circuit | Isamu Takano | 1995-02-21 |
| 5339185 | Optical timing extraction circuit | — | 1994-08-16 |
| 5231529 | Light amplifier for multi-wavelength signals | — | 1993-07-27 |
| 5202791 | Optical amplifying apparatus | — | 1993-04-13 |
| 4973124 | Wavelength drop-and-insert device | — | 1990-11-27 |
| 4835782 | Method and apparatus for an oscillation frequency separation among a plurality of laser devices | Naoki Shimosaka | 1989-05-30 |
| 4807227 | Optical wavelength-division switching system with coherent optical detection system | Masahiko Fujiwara, Minoru Shikada | 1989-02-21 |
| 4669086 | Frequency-stabilized semiconductor laser oscillator | Hiroyoshi Rangu | 1987-05-26 |
| 4474425 | Planar, optical star coupler for optical fibers | — | 1984-10-02 |
| 4425650 | Buried heterostructure laser diode | Ikuo Mito, Mitsuhiro Kitamura, Kohroh Kobayashi | 1984-01-10 |
| 4265513 | Light switch | Shigeo Matsushita, Ro Ishikawa, Ikuo Mito, Shigetoki Sugimoto | 1981-05-05 |