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3635908
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Patent number 3,635,908
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Issue date Jan 18, 1972
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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3499872
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Patent number 3,499,872
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Issue date Mar 10, 1970
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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3256213
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Patent number 3,256,213
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Issue date Jun 14, 1966
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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2855384
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Patent number 2,855,384
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Issue date Oct 7, 1958
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...