Akihiro Takagi

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Mito-shi, JP

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Patents Grantslast 30 patents

Information Patent Grant
Optical waveguide circuit
- Patent number 6,925,228
- Issue date Aug 2, 2005
- Nippon Telegraph and Telephone
- Shin Kamei
- G02 - OPTICS
Information Patent Grant
Guided-wave optical branching device
- Patent number 5,165,001
- Issue date Nov 17, 1992
- Nippon Telegraph & Telephone Corporation
- Akihiro Takagi
- G02 - OPTICS
Information Patent Grant
Guided-wave optical branching components and optical switches
- Patent number 5,044,715
- Issue date Sep 3, 1991
- Nippon Telegraph & Telephone Corporation
- Masao Kawachi
- G02 - OPTICS

Patents Applicationslast 30 patents

Information Patent Application
Optical waveguide circuit
- Publication number 20030118286
- Publication date Jun 26, 2003
- Nippon Telegraph and Telephone Corporation
- Shin Kamei
- G02 - OPTICS