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Hiromitsu Umezawa
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Aichi, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Magneto-optical device and manufacturing method thereof
Patent number
7,551,343
Issue date
Jun 23, 2009
FDK Corporation
Katsuhiro Iwasaki
G02 - OPTICS
Information
Patent Grant
Optical attenuator
Patent number
7,336,418
Issue date
Feb 26, 2008
FDK Corporation
Hirotaka Kawai
G02 - OPTICS
Information
Patent Grant
Magneto-optical device
Patent number
7,280,264
Issue date
Oct 9, 2007
FDK Corporation
Yuji Goto
G02 - OPTICS
Information
Patent Grant
Polarization separating/synthesizing element and optical device usi...
Patent number
7,009,767
Issue date
Mar 7, 2006
FDK Corporation
Masaharu Hoshikawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Faraday rotation angle varying device
Patent number
6,417,952
Issue date
Jul 9, 2002
FDK Corporation
Hirotaka Kawai
B82 - NANO-TECHNOLOGY
Information
Patent Grant
Faraday rotator
Patent number
6,288,827
Issue date
Sep 11, 2001
FDK Corporation
Hirotaka Kawai
G02 - OPTICS
Information
Patent Grant
Faraday rotation angle varying apparatus
Patent number
6,108,120
Issue date
Aug 22, 2000
FDK Corporation
Hirotaka Kawai
G02 - OPTICS
Information
Patent Grant
Magneto-optical element material and Faraday element using the same
Patent number
5,965,287
Issue date
Oct 12, 1999
FDK Corporation
Toshiyasu Suzuki
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Material for magneto-optical element and faraday rotator using the...
Patent number
5,566,017
Issue date
Oct 15, 1996
FDK Corporation
Toshiyasu Suzuki
B82 - NANO-TECHNOLOGY
Information
Patent Grant
Magneto-optical element material formed of magnetic garnet single c...
Patent number
5,547,613
Issue date
Aug 20, 1996
FDK Corporation
Hirotaka Kawai
C30 - CRYSTAL GROWTH
Information
Patent Grant
Polarization plane switch and optical switching device using the same
Patent number
5,521,741
Issue date
May 28, 1996
FDK Corporation
Hiromitsu Umezawa
G02 - OPTICS
Patents Applications
last 30 patents
Information
Patent Application
Magneto-Optical Device and Manufacturing Method thereof
Publication number
20080218841
Publication date
Sep 11, 2008
FDK CORPORATION
Katsuhiro Iwasaki
G02 - OPTICS
Information
Patent Application
Magneto-optical device
Publication number
20070002425
Publication date
Jan 4, 2007
Yuji Goto
G02 - OPTICS
Information
Patent Application
Polarization separating/synthesizing element and optical device usi...
Publication number
20040032635
Publication date
Feb 19, 2004
Masaharu Hoshikawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Polarizer and optical device using it
Publication number
20040013343
Publication date
Jan 22, 2004
Masaharu Hoshikawa
G02 - OPTICS