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Makoto Shimizu
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Mito-shi, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Optical fiber and production method thereof
Patent number
7,953,309
Issue date
May 31, 2011
Nippon Telegraph and Telephone Corporation
Atsushi Mori
C03 - GLASS MINERAL OR SLAG WOOL
Information
Patent Grant
Tellurite optical fiber and production method thereof
Patent number
7,677,059
Issue date
Mar 16, 2010
Nippon Telegraph and Telephone Corporation
Atsushi Mori
C03 - GLASS MINERAL OR SLAG WOOL
Information
Patent Grant
Optical amplifier having a constant gain profile
Patent number
7,589,888
Issue date
Sep 15, 2009
Nippon Telegraph and Telephone Corporation
Shinichi Aozasa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical amplifier
Patent number
7,538,937
Issue date
May 26, 2009
Nippon Telegraph and Telephone
Shinichi Aozasa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Fiber laser, spontaneous emission light source and optical fiber am...
Patent number
7,313,306
Issue date
Dec 25, 2007
Nippon Telegraph and Telephone Corporation
Makoto Yamada
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Optical amplifier
Patent number
7,042,634
Issue date
May 9, 2006
Nippon Telegraph and Telephone Corporation
Shinichi Aozasa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
White light source
Patent number
6,900,885
Issue date
May 31, 2005
Nippon Telegraph and Telephone Corporation
Hiroji Masuda
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Optical fiber amplifier and optical communication system using the...
Patent number
6,771,414
Issue date
Aug 3, 2004
Nippon Telegraph and Telephone Corporation
Hiroji Masuda
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Thulium-doped fiber amplifier using pump light for improving conver...
Patent number
6,721,092
Issue date
Apr 13, 2004
Nippon Telegraph and Telephone Corporation
Shinichi Aozasa
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Optical fibers for optical amplifiers
Patent number
5,668,659
Issue date
Sep 16, 1997
Nippon Telegraph & Telephone Corporation
Tadashi Sakamoto
H01 - BASIC ELECTRIC ELEMENTS
Patents Applications
last 30 patents
Information
Patent Application
OPTICAL FIBER AND PRODUCTION METHOD THEREOF
Publication number
20090060438
Publication date
Mar 5, 2009
Nippon Telegraph and Telephone Corporation
Atsushi Mori
G02 - OPTICS
Information
Patent Application
Optical amplifier
Publication number
20060146398
Publication date
Jul 6, 2006
Nippon Telephone and Telegraph Corporation
Shinichi Aozasa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical amplifier
Publication number
20060146397
Publication date
Jul 6, 2006
Nippon Telephone and Telegraph Corporation
Shinichi Aozasa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Fiber laser, spontaneous emission light source and optical fiber am...
Publication number
20060050367
Publication date
Mar 9, 2006
Makoto Yamada
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Application
Optical fiber and production method thereof
Publication number
20060010921
Publication date
Jan 19, 2006
Atsushi Mori
G02 - OPTICS
Information
Patent Application
Optical amplifier
Publication number
20040012843
Publication date
Jan 22, 2004
Nippon Telegraph and Telephone Corporation
Shinichi Aozasa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical fiber amplifier and optical communication system using the...
Publication number
20020167717
Publication date
Nov 14, 2002
Hiroji Masuda
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Application
Thulium-doped fiber amplifier using pump light for improving conver...
Publication number
20020159137
Publication date
Oct 31, 2002
Shinichi Aozasa
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Application
White light source
Publication number
20020131695
Publication date
Sep 19, 2002
Hiroji Masuda
H01 - BASIC ELECTRIC ELEMENTS