Issued Patents All Time
Showing 51–60 of 60 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6992320 | Semiconductor optical device with quantum dots having internal tensile or compressive strain | Hiroji Ebe, Yoshiaki Nakata | 2006-01-31 |
| 6925229 | Wavelength controllable optical device and light control method | — | 2005-08-02 |
| 6639240 | Photosemiconductor device and method for fabricating the same | — | 2003-10-28 |
| 6625337 | Wavelength-division multiplex optical signal processor and a method of regenerating a wavelength-division multiplexed optical signal | — | 2003-09-23 |
| 6405563 | Opaque silica glass article having transparent portion and process for producing same | Hiroya Nagata, Masayuki Kudo, Koji Tsukuma, Yoshikazu Kikuchi | 2002-06-18 |
| 6133178 | High purity transparent silica glass | Nobusuke Yamada, Shinkichi Hashimoto, Koji Tsukuma, Yoshikazu Kikuchi, Hideaki Segawa | 2000-10-17 |
| 5665133 | Process for production of pure transparent quartz | Koichi Orii, Yukinobu Hara, Koji Tsukuma, Yoshikazu Kikuchi | 1997-09-09 |
| 5229336 | Method of producing oxynitride glass | Koji Tsukuma | 1993-07-20 |
| 4968569 | Secondary battery | Kazuyuki Chiba, Ken Takahashi, Hajime Sudo, Masanori Ichida | 1990-11-06 |
| 4481464 | Apparatus for measuring time variant device impedance | Hitoshi Noguchi, Hideo Akama, Hideo Okara, Hisao Yoshino | 1984-11-06 |