Yukihiko Wakai

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Yokohama, JP

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Patents Grantslast 30 patents

Information Patent Grant
Optical regenerator and an optical transmission system
- Patent number 5,838,475
- Issue date Nov 17, 1998
- Hitachi, Ltd.
- Ryoji Takeyari
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical regenerator and an optical transmission system
- Patent number 5,576,876
- Issue date Nov 19, 1996
- Hitachi, Ltd.
- Ryoji Takeyari
- H04 - ELECTRIC COMMUNICATION TECHNIQUE