Masao Hoshikawa

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Yokohama City, JP

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Patents Grantslast 30 patents

Information Patent Grant
Methods for producing optical fiber preform and optical fiber
- Patent number 4,804,393
- Issue date Feb 14, 1989
- Sumitomo Electric Industries, Ltd.
- Koji Yano
- C03 - GLASS MINERAL OR SLAG WOOL
Information Patent Grant
Method for producing glass preform for optical fiber
- Patent number 4,693,738
- Issue date Sep 15, 1987
- Sumitomo Electric Industries, Ltd.
- Masao Hoshikawa
- C03 - GLASS MINERAL OR SLAG WOOL
Information Patent Grant
Manufacturing method of an optical waveguide
- Patent number 4,123,483
- Issue date Oct 31, 1978
- Sumitomo Electric Industries, Ltd.
- Tsuneo Nakahara
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL