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Optical waveguide
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Patent number 12,092,870
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Issue date Sep 17, 2024
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Nippon Telegraph and Telephone Corporation
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Takashi Go
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G02 - OPTICS
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Optical signal processing apparatus
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Patent number 12,022,246
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Issue date Jun 25, 2024
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Nippon Telegraph and Telephone Corporation
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Keita Yamaguchi
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Optical module
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Patent number 11,977,315
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Issue date May 7, 2024
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Nippon Telegraph and Telephone Corporation
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Ai Yanagihara
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H01 - BASIC ELECTRIC ELEMENTS
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Wavelength monitoring circuit
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Patent number 11,973,535
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Issue date Apr 30, 2024
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Nippon Telegraph and Telephone Corporation
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Osamu Moriwaki
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G01 - MEASURING TESTING
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Variable wavelength filter
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Patent number 11,112,561
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Issue date Sep 7, 2021
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Nippon Telegraph and Telephone Corporation
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Kenya Suzuki
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G02 - OPTICS
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Optical node device
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Patent number 10,965,375
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Issue date Mar 30, 2021
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Nippon Telegraph and Telephone Corporation
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Hirotaka Ono
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Optical signal processing device
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Patent number 10,797,817
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Issue date Oct 6, 2020
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Nippon Telegraph and Telephone Corporation
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Kazunori Seno
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Optical input/output device
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Patent number 9,588,300
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Issue date Mar 7, 2017
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Nippon Telegraph and Telephone Corporation
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Mitsumasa Nakajima
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G02 - OPTICS
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Optical switch
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Patent number 9,467,755
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Issue date Oct 11, 2016
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Nippon Telegraph and Telephone Corporation
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Kenya Suzuki
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Planar lightwave circuit
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Patent number 9,459,417
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Issue date Oct 4, 2016
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Nippon Telegraph and Telephone Corporation
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Yusuke Nasu
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G02 - OPTICS
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Waveguide type optical switch
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Patent number 9,360,629
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Issue date Jun 7, 2016
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Nippon Telegraph and Telephone Corporation
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Toshio Watanabe
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H04 - ELECTRIC COMMUNICATION TECHNIQUE