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Hirofumi Shimomura
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Tokyo, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Ring network for sharing protection resource by working communicati...
Patent number
7,280,470
Issue date
Oct 9, 2007
NEC Corporation
Tatsuya Shiragaki
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical switch, optical amplifier and optical power controller as w...
Patent number
7,197,246
Issue date
Mar 27, 2007
NEC Corporation
Hirofumi Shimomura
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical add-drop multiplexer
Patent number
6,895,183
Issue date
May 17, 2005
NEC Corporation
Hirofumi Shimomura
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical switch and optical network
Patent number
6,809,846
Issue date
Oct 26, 2004
NEC Corporation
Hirofumi Shimomura
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Ring network for sharing protection resource by working communicati...
Patent number
6,657,952
Issue date
Dec 2, 2003
NEC Corporation
Tatsuya Shiragaki
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical signal monitoring method and apparatus
Patent number
6,538,779
Issue date
Mar 25, 2003
NEC Corporation
Hitoshi Takeshita
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical switch, optical amplifier and optical power controller as w...
Patent number
6,466,344
Issue date
Oct 15, 2002
NEC Corporation
Hirofumi Shimomura
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical switch, optical amplifier and optical power controller as w...
Patent number
6,424,440
Issue date
Jul 23, 2002
NEC Corporation
Hirofumi Shimomura
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical add-drop multiplexer
Patent number
6,404,525
Issue date
Jun 11, 2002
NEC Corporation
Hirofumi Shimomura
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical signal repeating and amplifying device and optical level ad...
Patent number
6,400,498
Issue date
Jun 4, 2002
NEC Corporation
Hirofumi Shimomura
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical switch and optical switch system
Patent number
6,347,168
Issue date
Feb 12, 2002
NEC Corporation
Hirofumi Shimomura
G02 - OPTICS
Patents Applications
last 30 patents
Information
Patent Application
Optical switch and optical network
Publication number
20040114933
Publication date
Jun 17, 2004
NEC Corporation
Hirofumi Shimomura
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Ring network for sharing protection resource by working communicati...
Publication number
20040057375
Publication date
Mar 25, 2004
NEC Corporation
Tatsuya Shiragaki
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical switch, optical amplifier and optical power controller as w...
Publication number
20030048507
Publication date
Mar 13, 2003
NEC Corporation
Hirofumi Shimomura
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Application
Optical add-drop multiplexer
Publication number
20020131116
Publication date
Sep 19, 2002
NEC Corporation
Hirofumi Shimomura
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical signal repeating and amplifying device and optical level ad...
Publication number
20020126372
Publication date
Sep 12, 2002
Hirofumi Shimomura
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical switch, optical amplifier and optical power controller as w...
Publication number
20020003644
Publication date
Jan 10, 2002
NEC Corporation
Hirofumi Shimomura
H01 - BASIC ELECTRIC ELEMENTS