Yoshihiko Kasai

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Suwa, JP

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Patents Grantslast 30 patents

Information Patent Grant
Eyeglass lenses for correcting color vision
- Patent number 6,135,595
- Issue date Oct 24, 2000
- Seiko Epson Corporation
- Katsuyoshi Takeshita
- G02 - OPTICS
Information Patent Grant
Electronic sunglasses
- Patent number 5,015,086
- Issue date May 14, 1991
- Seiko Epson Corporation
- Etsuo Okaue
- G02 - OPTICS