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Contact lens
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Patent number 5,883,152
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Issue date Mar 16, 1999
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Nippon Oil and Fats Co., Ltd.
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Keizo Anan
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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Synthetic resin lens
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Patent number 4,930,879
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Issue date Jun 5, 1990
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Nippon Oil & Fats Co., Ltd.
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Takeaki Iryo
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G02 - OPTICS
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Optical resin from diallyl esters
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Patent number 4,855,374
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Issue date Aug 8, 1989
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Nippon Oil and Fats Co., Ltd.
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Yoshishige Murata
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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