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Shigehiro Takashima
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Tokyo, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Wavelength division multiplexing optical transmission equipment and...
Patent number
7,391,974
Issue date
Jun 24, 2008
Hitachi, Ltd.
Tetsuya Uda
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Wavelength division multiplexing optical transmission equipment and...
Patent number
7,194,210
Issue date
Mar 20, 2007
Hitachi, Ltd.
Tetsuya Uda
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Patents Applications
last 30 patents
Information
Patent Application
Wavelength division multiplexing optical transmission equipment and...
Publication number
20070166052
Publication date
Jul 19, 2007
Hitachi, Ltd
Tetsuya Uda
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Wavelength division multiplexing optical transmission equipment and...
Publication number
20020181061
Publication date
Dec 5, 2002
Hitachi, Ltd
Tetsuya Uda
H04 - ELECTRIC COMMUNICATION TECHNIQUE