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Process for producing an optical filter
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Patent number 5,567,778
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Issue date Oct 22, 1996
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Kureha Kagaku Kogyo Kabushiki Kaisha
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Teruo Sakagami
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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Optical filter
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Patent number 5,466,755
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Issue date Nov 14, 1995
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Kureha, Kagaku Kogyo Kabushiki Kaisha
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Teruo Sakagami
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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Photochromic lens
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Patent number 4,756,973
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Issue date Jul 12, 1988
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Kureha Kagaku Kogyo Kabushiki Kaisha
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Teruo Sakagami
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C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
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Halogen-containing resin lens material
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Patent number 4,704,006
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Issue date Nov 3, 1987
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Kureha Kagaku Kogyo Kabushiki Kaisha
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Teruo Sakagami
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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Lens materials of high refractive indexes
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Patent number 4,644,025
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Issue date Feb 17, 1987
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Kureha Kagaku Kogyo Kabushiki Kaisha
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Teruo Sakagami
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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Halogen-containing lens material
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Patent number 4,578,445
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Issue date Mar 25, 1986
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Kureha Kagaku Kogyo Kabushiki Kaisha
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Teruo Sakagami
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...