Yoshifumi Asai

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Oita, JP

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Patents Grantslast 30 patents

Information Patent Grant
Plastic lens material, production process of the material, composit...
- Patent number 6,586,508
- Issue date Jul 1, 2003
- Showa Denko K.K.
- Kazuhiko Ooga
- G02 - OPTICS

Patents Applicationslast 30 patents

Information Patent Application
Material for plastic lens, production process of the material, comp...
- Publication number 20030131548
- Publication date Jul 17, 2003
- Kazuhiko Ooga
- G02 - OPTICS
Information Patent Application
Plastic lens material, production process of the material, composit...
- Publication number 20030109615
- Publication date Jun 12, 2003
- Kazuhiko Ooga
- G02 - OPTICS