Issued Patents All Time
Showing 1–15 of 15 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9621299 | Coherent communication system, communication method, and transmission method | Koichi Ishihara, Masato Mizoguchi, Tomoki Murakami, Tomoyoshi Kataoka, Yoshiaki Kisaka +5 more | 2017-04-11 |
| 9614621 | Signal generating circuit, optical signal transmitting apparatus, signal receiving circuit, method for establishing optical signal synchronization, and optical signal synchronization system | Koichi Ishihara, Takayuki Kobayashi, Riichi Kudo, Yasushi Takatori, Munehiro Matsui +6 more | 2017-04-04 |
| 9520947 | Signal generating circuit, optical signal transmitting apparatus, signal receiving circuit, method for establishing optical signal synchronization, and optical signal synchronization system | Koichi Ishihara, Takayuki Kobayashi, Riichi Kudo, Yasushi Takatori, Munehiro Matsui +6 more | 2016-12-13 |
| 9178614 | Method for estimating amount of wavelength dispersion, wavelength dispersion compensation circuit, and receiving device | Etsushi Yamazaki, Takayuki Kobayashi, Masahito Tomizawa, Riichi Kudo, Koichi Ishihara +1 more | 2015-11-03 |
| 9160600 | Method for receiving frequency domain multiplexed signal and device for receiving frequency domain multiplexed signal | Riichi Kudo, Takayuki Kobayashi, Koichi Ishihara, Yasushi Takatori, Hideyuki Nosaka +6 more | 2015-10-13 |
| 8971703 | Wavelength dispersion amount estimation method, wavelength dispersion compensation circuit, and reception device | Etsushi Yamazaki, Takayuki Kobayashi, Masahito Tomizawa, Riichi Kudo, Koichi Ishihara +1 more | 2015-03-03 |
| 8934782 | Transmission method, reception method, transmitter apparatus, and receiver device | Etsushi Yamazaki, Koichi Ishihara, Takayuki Kobayashi, Riichi Kudo, Yasushi Takatori +5 more | 2015-01-13 |
| 8929750 | Signal generating circuit, optical signal transmitting apparatus, signal receiving circuit, method for establishing optical signal synchronization, and optical signal synchronization system | Koichi Ishihara, Takayuki Kobayashi, Riichi Kudo, Yasushi Takatori, Munehiro Matsui +6 more | 2015-01-06 |
| 8855485 | Frequency offset estimating method and frequency offset estimating apparatus | Yasushi Takatori, Riichi Kudo, Munehiro Matsui, Koichi Ishihara, Takayuki Kobayashi +5 more | 2014-10-07 |
| 8787769 | Chromatic dispersion value calculating apparatus, optical signal receiving apparatus, optical signal transmitting apparatus, and chromatic dispersion value calculation method | Koichi Ishihara, Takayuki Kobayashi, Riichi Kudo, Yasushi Takatori, Munehiro Matsui +6 more | 2014-07-22 |
| 8781029 | Frequency offset estimation apparatus, reception apparatus, frequency offset estimation method, and reception method | Munehiro Matsui, Koichi Ishihara, Riichi Kudo, Takayuki Kobayashi, Etsushi Yamazaki +5 more | 2014-07-15 |
| 7437929 | Liquid level detector | Shigeki Koide, Kiyoshi Enomoto, Yoshiyuki Shimazaki, Yoshihiro Kamimura, Tetsuya Satoh | 2008-10-21 |
| 6972685 | Liquid level sensor | Tetsuya Sato, Koichi Sato, Kiyoshi Enomoto, Toshio Hayakawa, Yoshiyuki Shimazaki | 2005-12-06 |
| 5789950 | Direct digital synthesizer | — | 1998-08-04 |
| 5714896 | Fractional-N frequency divider system | Tsuneo Tsukahara, Masao Suzuki, Tsutomu Kamoto | 1998-02-03 |