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Hideaki Arai
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Hitachi, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Interferometer for demodulating differential M-phase shift keying s...
Patent number
7,860,408
Issue date
Dec 28, 2010
Fujitsu Limited
Akihiko Isomura
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Waveguide-type optical multiplexer/demultiplexer
Patent number
6,947,631
Issue date
Sep 20, 2005
Hitachi Cable, Ltd.
Hideaki Arai
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical multiplexer/demultiplexer
Patent number
6,724,954
Issue date
Apr 20, 2004
Hitachi Cable, Inc.
Hideaki Arai
G02 - OPTICS
Information
Patent Grant
Optical multiplexer/demultiplexer
Patent number
6,631,223
Issue date
Oct 7, 2003
Hitachi Cable, Ltd.
Hideaki Arai
G02 - OPTICS
Information
Patent Grant
Glass wave guide element and method of manufacturing the same
Patent number
6,093,334
Issue date
Jul 25, 2000
Hitachi Cable, Ltd.
Ryoji Suzuki
G02 - OPTICS
Information
Patent Grant
Optical wavelength multiplexer/demultiplexer
Patent number
6,069,990
Issue date
May 30, 2000
Hitachi Cable Ltd.
Masahiro Okawa
G02 - OPTICS
Information
Patent Grant
Glass wave guide element and method of manufacturing the same
Patent number
6,031,957
Issue date
Feb 29, 2000
Hitachi Cable Ltd.
Ryoji Suzuki
G02 - OPTICS
Information
Patent Grant
Waveguide type grating device
Patent number
5,995,691
Issue date
Nov 30, 1999
Hitachi Cable, Ltd.
Hideaki Arai
G02 - OPTICS
Information
Patent Grant
Optical device formed with grating therein, add/drop filter using s...
Patent number
5,848,207
Issue date
Dec 8, 1998
Hitachi Cable, Ltd.
Hisato Uetsuka
G02 - OPTICS
Information
Patent Grant
Optical device formed with grating therein, add/drop filter using s...
Patent number
5,832,154
Issue date
Nov 3, 1998
Hitachi Cable, Ltd.
Hisato Uetsuka
G02 - OPTICS
Information
Patent Grant
Optical device having switching function
Patent number
5,812,709
Issue date
Sep 22, 1998
Hitachi Cable, Ltd.
Hideaki Arai
G02 - OPTICS
Information
Patent Grant
Guided-wave optical multi/demultiplexer
Patent number
5,499,308
Issue date
Mar 12, 1996
Hitachi Cable, Ltd.
Hideaki Arai
G02 - OPTICS
Patents Applications
last 30 patents
Information
Patent Application
Interferometer for demodulating differential M-phase shift keying s...
Publication number
20070177151
Publication date
Aug 2, 2007
FUJITSU LIMITED
Akihiko Isomura
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Waveguide-type optical multiplexer/demultiplexer
Publication number
20030091071
Publication date
May 15, 2003
Hideaki Arai
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical multiplexer/demultiplexer
Publication number
20010051018
Publication date
Dec 13, 2001
Hideaki Arai
G02 - OPTICS
Information
Patent Application
Optical multiplexer/Demultiplexer
Publication number
20010048786
Publication date
Dec 6, 2001
Hideaki Arai
G02 - OPTICS