Yoshiaki Tachikawa

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Mito, JP

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Patents Grantslast 30 patents

Information Patent Grant
Disk shaped tunable optical filter
- Patent number 6,157,025
- Issue date Dec 5, 2000
- Nippon Telegraph & Telephone Corporation
- Yoshitada Katagiri
- G02 - OPTICS
Information Patent Grant
Polarization independent optical nonreciprocal circuit based on eve...
- Patent number 5,905,823
- Issue date May 18, 1999
- Nippon Telegraph and Telephone Corporation
- Toshihiro Shintaku
- G02 - OPTICS
Information Patent Grant
Arrayed-wave guide grating multi/demultiplexer with loop-back optic...
- Patent number 5,414,548
- Issue date May 9, 1995
- Nippon Telegraph & Telephone Corporation
- Yoshiaki Tachikawa
- G02 - OPTICS