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Process for producing light control plate
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Patent number 5,164,223
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Issue date Nov 17, 1992
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Nippon Sheet Glass Co., Ltd.
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Toshifumi Tsujino
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Light control sheets
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Patent number 5,108,857
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Issue date Apr 28, 1992
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Sumitomo Chemical Company, Limited
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Shinichiro Kitayama
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G02 - OPTICS
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Plastic multifocal point spherical lens
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Patent number 4,944,584
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Issue date Jul 31, 1990
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Nippon Sheet Glass Co., Ltd.
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Koichi Maeda
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Light control sheets
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Patent number 4,929,523
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Issue date May 29, 1990
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Sumitomo Chemical Company Limited
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Shinichiro Kitayama
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G02 - OPTICS