Issued Patents All Time
Showing 76–94 of 94 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5861972 | Optical multiplex transmission equipment and method | Keiji Tomooka, Naohiro Sakakida, Shin Nishimura, Yoshihiro Ashi, Hironari Matsuda +6 more | 1999-01-19 |
| 5812289 | Optical repeater and optical transmitter | Keiji Tomooka, Naohiro Sakakida, Shin Nishimura, Yoshihiro Ashi, Hironari Matsuda +6 more | 1998-09-22 |
| 5739932 | Optical transmission system constructing method and system | Keiji Tomooka, Naohiro Sakakida, Shin Nishimura, Yoshihiro Ashi, Hironari Matsuda +6 more | 1998-04-14 |
| 5671074 | Optical multiplex transmission equipment and method | Keiji Tomooka, Naohiro Sakakida, Shin Nishimura, Yoshihiro Ashi, Hironari Matsuda +6 more | 1997-09-23 |
| 5606445 | Optical transmission system | Nobuhiko Kikuchi | 1997-02-25 |
| 5555477 | Optical transmission system constructing method and system | Keiji Tomooka, Naohiro Sakakida, Shin Nishimura, Yoshihiro Ashi, Hironari Matsuda +6 more | 1996-09-10 |
| 5515196 | Optical intensity and phase modulators in an optical transmitter apparatus | Shigeki Kitajima, Hirohisa Sano, Katsuhiko Kuboki | 1996-05-07 |
| 5500756 | Optical fiber transmission system and supervision method of the same | Hideaki Tsushima, Yukio Nakano, Hiroyuki Nakano, Ryoji Tateyari, Hironari Matsuda +9 more | 1996-03-19 |
| 5408349 | Optical frequency division multiplexing transmission system | Hideaki Tsushima, Katsuhiko Kuboki | 1995-04-18 |
| 5396361 | Frequency separation stabilization method for optical heterodyne or optical homodyne communication | Hideaki Tsushima, Minoru Maeda | 1995-03-07 |
| 5323258 | Homodyne optical receiver equipment | Hideaki Tsushima, Ryoji Takeyari, Shigeki Kitajima, Katsuhiko Kuboki | 1994-06-21 |
| 5305134 | Optical frequency division multiplexing transmitter and optical frequency division multiplexing transmission apparatus | Hideaki Tsushima, Shigeki Kitajima, Kiichi Yamashita | 1994-04-19 |
| 5274490 | Optical transmitter, optical receiver and optical transmission apparatus and control method of optical receiver | Hideaki Tsushima | 1993-12-28 |
| 5271890 | Method for producing carbon allotrope | Hirofumi Shimura, Yuji Enomoto | 1993-12-21 |
| 5144467 | Optical tuning method and apparatus suitable for selective reception of optical frequency division multiplex signals | Shigeki Kitajima, Kiichi Yamashita, Hideaki Tsushima | 1992-09-01 |
| 5142402 | Polarization diversity optical receiving apparatus and method | Hideaki Tsushima, Ryoji Takeyari | 1992-08-25 |
| 5113524 | Quantum state control apparatus, optical receiver and optical communication system | Osamu Hirota, Hideaki Tsushima, Yoshitaka Takasaki, Minoru Maeda | 1992-05-12 |
| 5023950 | Optical transmitter, optical receiver and optical transmission apparatus and control method of optical receiver | Hideaki Tsushima | 1991-06-11 |
| 4812776 | System for amplifying and shaping optical pulses | — | 1989-03-14 |