Yoshiaki Yamabayashi

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Tokyo, JP

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Patents Grantslast 30 patents

Information Patent Grant
Optical transmission system
- Patent number 6,587,242
- Issue date Jul 1, 2003
- Nippon Telegraph and Telephone Corporation
- Ippei Shake
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
System for monitoring quality of optical signals having different b...
- Patent number 6,396,601
- Issue date May 28, 2002
- Nippon Telegraph and Telephone Corporation
- Hidehiko Takara
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Wavelength dispersion measuring apparatus and polarization dispersi...
- Patent number 5,995,228
- Issue date Nov 30, 1999
- Anritsu Corporation
- Akihito Otani
- G01 - MEASURING TESTING
Information Patent Grant
Hitless path switching apparatus and method
- Patent number 5,631,896
- Issue date May 20, 1997
- Nippon Telegraph & Telephone Corporation
- Nobuyuki Kawase
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Line terminating equipment in SDH networks, using forward error cor...
- Patent number 5,574,717
- Issue date Nov 12, 1996
- Nippon Telegraph & Telephone Corporation
- Masahito Tomizawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

Information Patent Application
Optical Transmission System
- Publication number 20080226298
- Publication date Sep 18, 2008
- Nippon Telegraph and Telephone Corporation
- Hiroyuki Fukuyama
- H04 - ELECTRIC COMMUNICATION TECHNIQUE