Issued Patents All Time
Showing 1–25 of 37 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7116907 | Acousto-optical tunable filters cascaded together | Tadao Nakazawa, Hiroshi Onaka | 2006-10-03 |
| 6999223 | Optical modulator | Tetsuo Ishizaka, Takehito Tanaka, Masaharu Doi, Tadao Nakazawa | 2006-02-14 |
| 6853757 | Arrangement method of metal electrode and transparent electrode in optical waveguide device and optical modulator using the optical waveguide | — | 2005-02-08 |
| 6678428 | Optical modulator | Tetsuo Ishizaka, Takehito Tanaka, Masaharu Doi, Tadao Nakazawa | 2004-01-13 |
| 6640078 | Electrophotographic apparatus having a paper holding member | Kenji Ishii, Masayuki Ainoya, Junji Shirakawa, Hideki Ando | 2003-10-28 |
| 6606424 | Apparatus and method for optical modulation and demodulation | Hiroki Ooi, George Ishikawa | 2003-08-12 |
| 6400881 | Optical device having thin film formed over optical waveguide | Tadao Nakazawa, Shinji Taniguchi | 2002-06-04 |
| 6370308 | Acousto-optical device | Tadao Nakazawa, Shinji Taniguchi | 2002-04-09 |
| 6337931 | Effective optical path length compensable optical device | — | 2002-01-08 |
| 6259886 | Electrophotographic printing apparatus | Kenji Ishii | 2001-07-10 |
| 6243516 | Merging optical waveguides having branch angle within a specific range | — | 2001-06-05 |
| 6104847 | Optical device having an optical waveguide structure | — | 2000-08-15 |
| 6055349 | Optical waveguide device and manufacturing method therefor | Shinji Taniguchi | 2000-04-25 |
| 5995685 | Optical modulator and an optical modulating method | — | 1999-11-30 |
| 5949925 | Method, device, and system for optical modulation in wavelength division multiplexing | — | 1999-09-07 |
| 5937261 | Image recording apparatus, and sheet conveying method thereof | Junji Shirakawa, Masayuki Ainoya | 1999-08-10 |
| 5680497 | Optical waveguide device | Tadao Nakazawa, Takashi Yamane, Yoshinobu Kubota, Masaharu Doi, Kunio Sugeta +1 more | 1997-10-21 |
| 5408544 | Optical modulator for producing a controllable chirp | — | 1995-04-18 |
| 5404412 | Optical waveguide device | Tadao Nakazawa, Takashi Yamane, Yoshinobu Kubota, Masaharu Doi, Kunio Sugeta +1 more | 1995-04-04 |
| 5214724 | Optical waveguide device with suppressed DC drift | Naoyuki Mekada, Tadao Nakazawa, Yoshinobu Kubota, Masaharu Doi | 1993-05-25 |
| 5206784 | Charger for electrophotography having a grid assembly | Yasushi Kimiwada, Akira Terakado, Yasushi Hashimoto, Koji Kato, Isamu Komatsu | 1993-04-27 |
| 5161046 | Beam position control apparatus | Minoru Ohshima, Shuichi Morio, Susumu Saitoh, Osamu Namikawa, Kazutoshi Obara +4 more | 1992-11-03 |
| 5106724 | Developer for light-sensitive lithographic printing plate capable of processing commonly the negative-type and the positive-type and developer composition for light-sensitive material | Akira Nogami, Masafumi Uehara, Miegi Nakano | 1992-04-21 |
| 5089839 | Method of processing pre-sensitized lithographic printing plate and apparatus therefor | Miegi Nakano, Masafumi Uehara, Akira Nogami | 1992-02-18 |
| 5074631 | Optical modulator | Hiroshi Hamano, Izumi Amemiya, Hiroshi Nishimoto, Takefumi Namiki, Izumi Yokota +1 more | 1991-12-24 |