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Kawasaki, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Optical amplifier
Patent number
8,379,299
Issue date
Feb 19, 2013
Fujitsu Limited
Tomoaki Takeyama
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Optical amplifier using delayed phase matching fiber
Patent number
8,194,309
Issue date
Jun 5, 2012
Fujitsu Limited
Takashi Shimizu
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical transmission apparatus and optical attenuation amount contr...
Patent number
8,116,626
Issue date
Feb 14, 2012
Fujitsu Limited
Tomoaki Takeyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical amplifier
Patent number
8,077,383
Issue date
Dec 13, 2011
Fujitsu Limited
Tomoaki Takeyama
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Photo-detecting apparatus and photo-detecting method
Patent number
8,026,538
Issue date
Sep 27, 2011
Fujitsu Limited
Tomoaki Takeyama
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Optical transmission system
Patent number
7,990,608
Issue date
Aug 2, 2011
Fujitsu Limited
Tomoaki Takeyama
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Optical amplifier
Patent number
7,643,206
Issue date
Jan 5, 2010
Fujitsu Limited
Tomoaki Takeyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical transmission apparatus
Patent number
7,616,848
Issue date
Nov 10, 2009
Fujitsu Limited
Tomoaki Takeyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Wavelength division multiplexed optical amplifier
Patent number
7,330,303
Issue date
Feb 12, 2008
Fujitsu Limited
Takashi Sato
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical fiber connecting portion structure and light monitor apparatus
Patent number
7,296,940
Issue date
Nov 20, 2007
Fujitsu Limited
Norifumi Shukunami
G02 - OPTICS
Information
Patent Grant
Optical amplifier
Patent number
7,236,294
Issue date
Jun 26, 2007
Fujitsu Limited
Tomoaki Takeyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Variable dispersion compensator utilizing wavelength conversion
Patent number
7,139,453
Issue date
Nov 21, 2006
Fujitsu Limited
Tomoaki Takeyama
G02 - OPTICS
Information
Patent Grant
Optical amplifier using delayed phase matching fiber
Patent number
7,136,219
Issue date
Nov 14, 2006
Fujitsu Limited
Takashi Shimizu
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical amplifier
Patent number
7,085,043
Issue date
Aug 1, 2006
Fujitsu Limited
Tomoaki Takeyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical fiber amplifier
Patent number
6,738,182
Issue date
May 18, 2004
Fujitsu Limited
Shinya Inagaki
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Optical amplifier for amplifying multi-wavelength light
Patent number
6,738,184
Issue date
May 18, 2004
Fujitsu Limited
Etsuko Hayashi
H01 - BASIC ELECTRIC ELEMENTS
Patents Applications
last 30 patents
Information
Patent Application
OPTICAL AMPLIFIER
Publication number
20100245988
Publication date
Sep 30, 2010
FUJITSU LIMITED
Tomoaki Takeyama
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Application
Optical transmission apparatus and optical attenuation amount contr...
Publication number
20090297143
Publication date
Dec 3, 2009
FUJITSU LIMITED
Tomoaki Takeyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Photo-detecting apparatus and photo-detecting method
Publication number
20090206437
Publication date
Aug 20, 2009
FUJITSU LIMITED
Tomoaki Takeyama
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Application
OPTICAL AMPLIFIER
Publication number
20080239467
Publication date
Oct 2, 2008
FUJITSU LIMITED
Tomoaki Takeyama
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Application
OPTICAL AMPLIFIER AND METHOD OF CONTROLLING THE SAME
Publication number
20080074731
Publication date
Mar 27, 2008
FUJITSU LIMITED
Tomoaki Takeyama
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Application
Optical transmission apparatus
Publication number
20070274725
Publication date
Nov 29, 2007
FUJITSU LIMITED
Tomoaki Takeyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical amplifier
Publication number
20070229941
Publication date
Oct 4, 2007
FUJITSU LIMITED
Tomoaki Takeyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical amplifier using delayed phase matching fiber
Publication number
20070041084
Publication date
Feb 22, 2007
FUJITSU LIMITED
Takashi Shimizu
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical fiber connecting portion structure and light monitor apparatus
Publication number
20070036499
Publication date
Feb 15, 2007
FUJITSU LIMITED
Norifumi Shukunami
G02 - OPTICS
Information
Patent Application
OPTICAL AMPLIFIER
Publication number
20060087723
Publication date
Apr 27, 2006
FUJITSU LIMITED
Tomoaki Takeyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical amplifier using delayed phase matching fiber
Publication number
20050179992
Publication date
Aug 18, 2005
FUJITSU LIMITED
Takashi Shimizu
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical amplifier
Publication number
20050146782
Publication date
Jul 7, 2005
FUJITSU LIMITED
Tomoaki Takeyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Wavelength division multiplexed optical amplifier
Publication number
20050078358
Publication date
Apr 14, 2005
FUJITSU LIMITED
Takashi Sato
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Variable dispersion compensator utilizing wavelength conversion
Publication number
20040258352
Publication date
Dec 23, 2004
Tomoaki Takeyama
G02 - OPTICS
Information
Patent Application
Optical fiber amplifier
Publication number
20020141045
Publication date
Oct 3, 2002
FUJITSU LIMITED
Shinya Inagaki
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Application
Optical amplifier for amplifying multi-wavelength light
Publication number
20020101652
Publication date
Aug 1, 2002
FUJITSU LIMITED
Etsuko Hayashi
H01 - BASIC ELECTRIC ELEMENTS