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3486624
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Patent number 3,486,624
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Issue date Dec 30, 1969
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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2885082
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Patent number 2,885,082
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Issue date May 5, 1959
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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1259032
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Patent number 1,259,032
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Issue date Mar 12, 1918
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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924131
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Patent number 924,131
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Issue date Jun 8, 1909
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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842484
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Patent number 842,484
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Issue date Jan 29, 1907
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL