Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6400497 | Optical fiber amplifier | Mikiya Suzuki, Shigeru Shikii, Yukihiro Ozeki | 2002-06-04 |
| 5440418 | Method and apparatus for alarm surveillance for an optical transmission system | Katsuhiro Ishimura, Hiroshi Takamoto | 1995-08-08 |
| 4992922 | Variable high-voltage generating circuit | Katsuhiro Ishimura | 1991-02-12 |