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Patent applications and USPTO patent grants for Hamada; Yuuhiko.The latest application filed is for "semiconductor laser device and optical fiber amplifier".
Patent | Date |
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Semiconductor laser device and optical fiber amplifier App 20060268396 - Sakai; Kiyohide ;   et al. | 2006-11-30 |
Semiconductor laser device and optical fiber amplifier App 20050007657 - Sakai, Kiyohide ;   et al. | 2005-01-13 |
Semiconductor laser device and optical fiber amplifier Grant 6,819,688 - Sakai , et al. November 16, 2 | 2004-11-16 |
Semiconductor laser device and optical fiber amplifier App 20030103544 - Sakai, Kiyohide ;   et al. | 2003-06-05 |
Optical isolator for transmitting light propagating forward and not transmitting light propagating backward, laser module using the optical isolator, optical amplifier using the optical isolator and polarizing filter used for a polarizer and an analyzer of the optical isolator App 20030030889 - Sakai, Kiyohide ;   et al. | 2003-02-13 |
Optical isolator, laser module and optical amplifier App 20030030888 - Sakai, Kiyohide ;   et al. | 2003-02-13 |
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