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2669438
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Patent number 2,669,438
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Issue date Feb 16, 1954
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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2584805
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Patent number 2,584,805
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Issue date Feb 5, 1952
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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2239152
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Patent number 2,239,152
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Issue date Apr 22, 1941
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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1761179
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Patent number 1,761,179
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Issue date Jun 3, 1930
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL