Seiji Norimatsu

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Tokyo, JP

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Patents Grantslast 30 patents

Information Patent Grant
Wavelength division multiplex optical transmission system
- Patent number 7,003,226
- Issue date Feb 21, 2006
- Nippon Telegraph and Telephone Corporation
- Tadashi Sakamoto
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Wavelength division multiplexing optical transmission system
- Patent number 6,490,064
- Issue date Dec 3, 2002
- Nippon Telegraph and Telephone Corporation
- Tadashi Sakamoto
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical transmission system
- Patent number 5,543,952
- Issue date Aug 6, 1996
- Nippon Telegraph & Telephone Corporation
- Kazushige Yonenaga
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

Information Patent Application
Wavelength division multiplex optical transmission system
- Publication number 20020067525
- Publication date Jun 6, 2002
- Tadashi Sakamoto
- H04 - ELECTRIC COMMUNICATION TECHNIQUE