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Tokyo, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Optical transmission system and optical amplification method used i...
Patent number
7,894,127
Issue date
Feb 22, 2011
NEC Corporation
Ryu Yokoyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical transmission system and optical amplification method used i...
Patent number
7,688,501
Issue date
Mar 30, 2010
NEC Corporation
Ryu Yokoyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical amplifying and relaying system
Patent number
7,123,405
Issue date
Oct 17, 2006
NEC Corporation
Ryu Yokoyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical amplifying and relaying system
Patent number
6,868,204
Issue date
Mar 15, 2005
NEC Corporation
Ryu Yokoyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical amplifying and relaying system
Patent number
6,845,192
Issue date
Jan 18, 2005
NEC Corporation
Ryu Yokoyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical amplifier, optical amplifying repeater and transmission app...
Patent number
6,704,134
Issue date
Mar 9, 2004
NEC Corporation
Ryu Yokoyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical signal repeater and output level control method used in thi...
Patent number
6,658,211
Issue date
Dec 2, 2003
NEC Corporation
Ryu Yokoyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical amplifier repeater
Patent number
6,603,587
Issue date
Aug 5, 2003
NEC Corporation
Ryu Yokoyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical regeneration circuit for regenerating signal with deteriora...
Patent number
6,504,637
Issue date
Jan 7, 2003
NEC Corporation
Ryu Yokoyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Patents Applications
last 30 patents
Information
Patent Application
OPTICAL TRANSMISSION SYSTEM AND OPTICAL AMPLIFICATION METHOD USED I...
Publication number
20090296198
Publication date
Dec 3, 2009
NEC Corporation
Ryu Yokoyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Supervising system, supervising apparatus and supervising method of...
Publication number
20060140627
Publication date
Jun 29, 2006
NEC Corporation
Ryu Yokoyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical amplifier, optical amplifying repeater and transmission app...
Publication number
20050185258
Publication date
Aug 25, 2005
NEC Corporation
Ryu Yokoyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical amplifier, optical amplifying repeater and transmission app...
Publication number
20050094251
Publication date
May 5, 2005
NEC Corporation
Ryu Yokoyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical amplifier, optical amplifying repeater and transmission app...
Publication number
20050088725
Publication date
Apr 28, 2005
NEC Corporation
Ryu Yokoyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical transmission system with optical amplifier repeaters
Publication number
20040184817
Publication date
Sep 23, 2004
NEC Corporation
Jyunko Iwasaki
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical amplifier, optical amplifying repeater and transmission app...
Publication number
20040170434
Publication date
Sep 2, 2004
NEC Corporation
Ryu Yokoyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical amplifying and relaying system
Publication number
20040161244
Publication date
Aug 19, 2004
NEC Corporation
Ryu Yokoyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical amplifying and relaying system
Publication number
20040161191
Publication date
Aug 19, 2004
NEC Corporation
Ryu Yokoyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical transmission system and optical amplification method using...
Publication number
20040027649
Publication date
Feb 12, 2004
NEC Corporation
Ryu Yokoyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical amplifying and relaying system
Publication number
20020131696
Publication date
Sep 19, 2002
Ryu Yokoyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical amplifier, optical amplifying repeater and transmission app...
Publication number
20010019448
Publication date
Sep 6, 2001
Ryu Yokoyama
H01 - BASIC ELECTRIC ELEMENTS