Shoji Yamada

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Kamakura, JP

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Patents Grantslast 30 patents

Information Patent Grant
Two-way optical transmission system
- Patent number 4,880,289
- Issue date Nov 14, 1989
- Hitachi, Ltd.
- Katsuyuki Imoto
- G02 - OPTICS
Information Patent Grant
Switch for optical transmission lines
- Patent number 4,337,995
- Issue date Jul 6, 1982
- Hitachi, Ltd.
- Toshiki P. Tanaka
- G02 - OPTICS
Information Patent Grant
Optical measurement system
- Patent number 4,260,883
- Issue date Apr 7, 1981
- Hitachi, Ltd.
- Seiichi Onoda
- G01 - MEASURING TESTING