Issued Patents All Time
Showing 1–17 of 17 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6271942 | Optical transmission device and system | Hiroyuki Sasai, Hiroaki Yamamoto, Kuniaki Utsumi, Yutaka Fuke | 2001-08-07 |
| 5923458 | Frequency modulator | Masaru Fuse, Koji Kikushima | 1999-07-13 |
| 5875049 | Amplifier for burst signal and optical receiving circuit | Hiroaki Asano, Hiroaki Yamamoto | 1999-02-23 |
| 5850303 | Optical transmission system and optical transmission device used therefor | Hiroaki Yamamoto, Hiroyuki Sasai, Susumu Morikura | 1998-12-15 |
| 5768449 | Optical transmission system and optical transmission method | Masaru Fuse | 1998-06-16 |
| 5729281 | Catv system in which chanel selection signal is transmitted from the subscriber location | Kuniaki Utsumi, Hiroyuki Sasai, Hiroaki Yamamoto, Manabu Tanabe | 1998-03-17 |
| 5644389 | Method for measuring distance between reflection points along light transmission line and reflectance thereof | Hiroaki Yamamoto, Kuniaki Utsumi | 1997-07-01 |
| 5541757 | Optical fiber cable service system provided with video on demand service | Masaru Fuse, Hiroaki Nakata | 1996-07-30 |
| 5532865 | Fiber optic communication terminal, fiber optic communication system, and its wavelength setting method | Kuniaki Utsumi, Hiroaki Yamamoto | 1996-07-02 |
| 5530583 | Optical signal amplification apparatus and an optical fiber transmission system using the same | Tomoaki Uno, Jun Ohya | 1996-06-25 |
| 5339315 | Cable broadcasting system and the transmission center for on demand program services | Kazuki Maeda, Kuniaki Utsumi | 1994-08-16 |
| 4722081 | Analog optical transmission system | Yoshiki Nishino, Takeshige Ichida | 1988-01-26 |
| 4677630 | Oscillation frequency stabilized semiconductor laser | Toshihiro Fujita, Satoshi Ishizuka, Hisanao Sato | 1987-06-30 |
| 4611352 | Optical transmission apparatus | Hiroaki Nakata, Takeshige Ichida | 1986-09-09 |
| 4449188 | Apparatus and method for controlling humidity | Takehiko Unoguchi, Seiro Hasegawa, Atsushi Nishino, Akihiko Yoshida | 1984-05-15 |
| 4282480 | Apparatus for humidity detection | Seiro Hasegawa, Takehiko Unoguchi, Atsushi Nishino, Akihiko Yoshida | 1981-08-04 |
| 4278318 | Holographic reconstructing apparatus | Yoshikazu Nakayama, Fumikazu Tateishi | 1981-07-14 |