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3306871
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Patent number 3,306,871
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Issue date Feb 28, 1967
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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2626252
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Patent number 2,626,252
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Issue date Jan 20, 1953
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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2443167
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Patent number 2,443,167
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Issue date Jun 8, 1948
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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2440494
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Patent number 2,440,494
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Issue date Apr 27, 1948
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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2404220
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Patent number 2,404,220
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Issue date Jul 16, 1946
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...