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Naokatsu Ohkawa
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Kawasaki, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Optical transmission apparatus in ring transmission system
Patent number
7,720,380
Issue date
May 18, 2010
Fujitsu Limited
Tomoyuki Harada
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Message transfer method and apparatus
Patent number
7,162,544
Issue date
Jan 9, 2007
Fujitsu Limited
Naokatsu Ohkawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Patents Applications
last 30 patents
Information
Patent Application
Optical bi-directional line-switched ring transmission system, tran...
Publication number
20080181606
Publication date
Jul 31, 2008
FUJITSU LIMITED
Naokatsu Ohkawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Ring network system, node device, and protection band testing metho...
Publication number
20070217330
Publication date
Sep 20, 2007
FUJITSU LIMITED
Naokatsu Ohkawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical transmission apparatus in ring transmission system
Publication number
20070172238
Publication date
Jul 26, 2007
Tomoyuki Harada
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Signal transmission method and device
Publication number
20070070884
Publication date
Mar 29, 2007
FUJITSU LIMITED
Naokatsu Ohkawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Node device, communication system and method for redundancy configu...
Publication number
20060067211
Publication date
Mar 30, 2006
FUJITSU LIMITED
Naokatsu Ohkawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Message transfer method and apparatus
Publication number
20020087733
Publication date
Jul 4, 2002
Naokatsu Ohkawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE