Issued Patents All Time
Showing 1–14 of 14 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9496966 | Optical communication receiving device and frequency offset compensation method | Kazuhiko Hatae, Nobukazu Koizumi, Manabu Yamazaki, Tomoki Katou, Masashi Sato +1 more | 2016-11-15 |
| 9444554 | Digital coherent receiving apparatus | Nobukazu Koizumi, Takeshi Hoshida, Takahito Tanimura, Hisao Nakashima, Noriyasu Nakayama | 2016-09-13 |
| 8693898 | Adaptive equalizer, optical receiver, and tap coefficient correcting method | Nobukazu Koizumi, Kazuhiko Hatae, Noriyasu Nakayama, Hisao Nakashima, Kosuke Komaki | 2014-04-08 |
| 8649689 | Digital coherent receiving apparatus | Nobukazu Koizumi, Takeshi Hoshida, Takahito Tanimura, Hisao Nakashima, Noriyasu Nakayama | 2014-02-11 |
| 8536911 | PLL circuit, method of controlling PLL circuit, and digital circuit | Yoshito Koyama | 2013-09-17 |
| 8488062 | Analog-digital converting apparatus and clock signal output apparatus | Yoshito Koyama | 2013-07-16 |
| 8436665 | Digital PLL circuit and clock generating method | Yoshito Koyama | 2013-05-07 |
| 8183940 | Temperature control device | Yoshito Koyama, Minoru Hirahara | 2012-05-22 |
| 7664217 | Digital PLL circuit | Yoshito Koyama | 2010-02-16 |
| 7417477 | PLL circuit | Yoshito Koyama | 2008-08-26 |
| 7368962 | Clock supply device | Yoshito Koyama | 2008-05-06 |
| 7355457 | Frequency synthesizer | Yoshito Koyama | 2008-04-08 |
| 7330057 | DPLL circuit having holdover function | — | 2008-02-12 |
| 6300841 | Atomic oscillator utilizing a high frequency converting circuit and an active, low-integral-number multiplier | Ken Atsumi, Hideyuki Matsuura, Yoshifumi Nakajima, Yoshito Koyama, Minoru Sakai | 2001-10-09 |