Hiroaki Yamada

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Katsuta, JP

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Patents Grantslast 30 patents

Information Patent Grant
Optical waveguide circuit, its manufacturing method and optical wav...
- Patent number 6,304,687
- Issue date Oct 16, 2001
- Nippon Telegraph and Telephone Corporation
- Yasuyuki Inoue
- G02 - OPTICS
Information Patent Grant
Wavelength division multi/demultiplexer
- Patent number 6,278,813
- Issue date Aug 21, 2001
- Nippon Telegraph and Telephone Corporation
- Kazumasa Takada
- G02 - OPTICS
Information Patent Grant
Guided-wave circuit with optical characteristics adjusting plate, m...
- Patent number 5,940,548
- Issue date Aug 17, 1999
- Nippon Telegraph & Telephone Corporation
- Hiroaki Yamada
- G02 - OPTICS
Information Patent Grant
Reflectometry of an optical waveguide using a low coherence reflect...
- Patent number 5,543,912
- Issue date Aug 6, 1996
- Nippon Telegraph & Telephone Corporation
- Kazumasa Kada
- G01 - MEASURING TESTING