Tooru Hirai

Person

Yokohama, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Optical, network, node apparatus and method for recovery path fault
- Patent number 7,848,646
- Issue date Dec 7, 2010
- Hitachi, Ltd.
- Yasuyuki Fukashiro
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical crossconnect apparatus
- Patent number 7,447,398
- Issue date Nov 4, 2008
- Hitachi Communication Technologies, Ltd.
- Tooru Hirai
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Variable dispersion compensation equipment, optical transmission sy...
- Patent number 7,435,013
- Issue date Oct 14, 2008
- Hitachi Communication Technologies, Ltd.
- Tooru Hirai
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Dispersion compensation device and dispersion compensation method
- Patent number 7,415,177
- Issue date Aug 19, 2008
- Hitachi Communication Technologies, Ltd.
- Yasuyuki Fukashiro
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Dispersion compensation device and dispersion compensation method
- Patent number 7,218,818
- Issue date May 15, 2007
- Hitachi Communication Technologies, Ltd.
- Yasuyuki Fukashiro
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical switching apparatus and optical switching method
- Patent number 7,215,843
- Issue date May 8, 2007
- Hitachi, Ltd.
- Yasuyuki Fukashiro
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical switching apparatus and optical switching method
- Patent number 6,987,899
- Issue date Jan 17, 2006
- Hitachi, Ltd.
- Yasuyuki Fukashiro
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical switching apparatus and optical switching method
- Patent number 6,985,649
- Issue date Jan 10, 2006
- Hitachi, Ltd.
- Yasuyuki Fukashiro
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical switching apparatus and optical switching method
- Patent number 6,714,697
- Issue date Mar 30, 2004
- Hitachi, Ltd.
- Yasuyuki Fukashiro
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

Information Patent Application
Dispersion compensation device and dispersion compensation method
- Publication number 20070223926
- Publication date Sep 27, 2007
- Yasuyuki Fukashiro
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Optical crossconnect apparatus
- Publication number 20070189663
- Publication date Aug 16, 2007
- Tooru Hirai
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Optical network, node apparatus and method for relieving path fault
- Publication number 20070036544
- Publication date Feb 15, 2007
- Yasuyuki Fukashiro
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Variable dispersion compensation equipment, optical transmission sy...
- Publication number 20060133722
- Publication date Jun 22, 2006
- Tooru Hirai
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Dispersion compensation device and dispersion compensation method
- Publication number 20060133815
- Publication date Jun 22, 2006
- Yasuyuki Fukashiro
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Optical switching apparatus and optical switching method
- Publication number 20050191006
- Publication date Sep 1, 2005
- Yasuyuki Fukashiro
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Optical switching apparatus and optical switching method
- Publication number 20040120714
- Publication date Jun 24, 2004
- Yasuyuki Fukashiro
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Optical switching apparatus and optical switching method
- Publication number 20020191892
- Publication date Dec 19, 2002
- Yasuyuki Fukashiro
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Optical switching apparatus and optical switching method
- Publication number 20020191891
- Publication date Dec 19, 2002
- Yasuyuki Fukashiro
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Tooru Hirai

Person

Patents Grantslast 30 patents

Optical, network, node apparatus and method for recovery path fault

Optical crossconnect apparatus

Variable dispersion compensation equipment, optical transmission sy...

Dispersion compensation device and dispersion compensation method

Dispersion compensation device and dispersion compensation method

Optical switching apparatus and optical switching method

Optical switching apparatus and optical switching method

Optical switching apparatus and optical switching method

Optical switching apparatus and optical switching method

Patents Applicationslast 30 patents

Dispersion compensation device and dispersion compensation method

Optical crossconnect apparatus

Optical network, node apparatus and method for relieving path fault

Variable dispersion compensation equipment, optical transmission sy...

Dispersion compensation device and dispersion compensation method

Optical switching apparatus and optical switching method

Optical switching apparatus and optical switching method

Optical switching apparatus and optical switching method

Optical switching apparatus and optical switching method