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Kawasaki-shi, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Transmission device with function of packetizing and transmitting
Patent number
8,634,426
Issue date
Jan 21, 2014
Hitachi, Ltd.
Yoshio Nogi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical transmission system and signal speed converting apparatus
Patent number
7,769,257
Issue date
Aug 3, 2010
Hitachi, Ltd.
Nobuhiko Kikuchi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical transmission system constructing method and system
Patent number
7,292,785
Issue date
Nov 6, 2007
Hitachi, Ltd.
Keiji Tomooka
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical transmission system constructing method and system
Patent number
7,167,652
Issue date
Jan 23, 2007
Hitachi, Ltd.
Keiji Tomooka
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical transmission system constructing method and system
Patent number
6,728,489
Issue date
Apr 27, 2004
Hitachi, Ltd.
Keiji Tomooka
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical transmission equipment which transmits an amplified optical...
Patent number
6,266,169
Issue date
Jul 24, 2001
Hitachi, Ltd.
Keiji Tomooka
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical transmission equipment which transmits an amplified optical...
Patent number
6,018,405
Issue date
Jan 25, 2000
Hitachi, Ltd.
Keiji Tomooka
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical wavelength multiplexing system
Patent number
6,005,699
Issue date
Dec 21, 1999
Hitachi, Ltd.
Keiji Tomooka
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical repeater and optical transmitter
Patent number
5,875,046
Issue date
Feb 23, 1999
Hitachi, Ltd.
Keiji Tomooka
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical multiplex transmission equipment and method
Patent number
5,861,972
Issue date
Jan 19, 1999
Hitachi, Ltd.
Keiji Tomooka
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical repeater and optical transmitter
Patent number
5,812,289
Issue date
Sep 22, 1998
Hitachi, Ltd.
Keiji Tomooka
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical transmission system constructing method and system
Patent number
5,739,932
Issue date
Apr 14, 1998
Hitachi, Ltd.
Keiji Tomooka
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical multiplex transmission equipment and method
Patent number
5,671,074
Issue date
Sep 23, 1997
Hitachi, Ltd.
Keiji Tomooka
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical transmission system constructing method and system
Patent number
5,555,477
Issue date
Sep 10, 1996
Hitachi, Ltd.
Keiji Tomooka
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical fiber transmission system and supervision method of the same
Patent number
5,500,756
Issue date
Mar 19, 1996
Hitachi, Ltd.
Hideaki Tsushima
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Patents Applications
last 30 patents
Information
Patent Application
TRANSMISSION DEVICE
Publication number
20120027023
Publication date
Feb 2, 2012
Hitachi, Ltd.
Yoshio Nogi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL TRANSMISSION SYSTEM AND SIGNAL SPEED CONVERTING APPARATUS
Publication number
20090116839
Publication date
May 7, 2009
Hitachi Communications Technologies, Ltd.
Nobuhiko Kikuchi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical transmission system constructing method and system
Publication number
20070053687
Publication date
Mar 8, 2007
Keiji Tomooka
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical transmission system constructing method and system
Publication number
20040161189
Publication date
Aug 19, 2004
Hitachi, Ltd.
Keiji Tomooka
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical transmission system constructing method and system
Publication number
20020024699
Publication date
Feb 28, 2002
Hitachi, Ltd
Keiji Tomooka
H04 - ELECTRIC COMMUNICATION TECHNIQUE