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3261626
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Patent number 3,261,626
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Issue date Jul 19, 1966
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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2535437
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Patent number 2,535,437
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Issue date Dec 26, 1950
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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1994649
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Patent number 1,994,649
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Issue date Mar 19, 1935
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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1454945
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Patent number 1,454,945
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Issue date May 15, 1923
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C01 - INORGANIC CHEMISTRY