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3597359
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Patent number 3,597,359
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Issue date Aug 3, 1971
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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2318013
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Patent number 2,318,013
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Issue date May 4, 1943
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
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2137782
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Patent number 2,137,782
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Issue date Nov 22, 1938
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...