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3883400
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Patent number 3,883,400
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Issue date May 13, 1975
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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3326778
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Patent number 3,326,778
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Issue date Jun 20, 1967
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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3298932
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Patent number 3,298,932
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Issue date Jan 17, 1967
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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2893926
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Patent number 2,893,926
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Issue date Jul 7, 1959
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
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1361834
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Patent number 1,361,834
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Issue date Dec 14, 1920
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL