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3727378
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C01 - INORGANIC CHEMISTRY
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3681895
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Patent number 3,681,895
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C01 - INORGANIC CHEMISTRY
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3475124
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Patent number 3,475,124
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Issue date Oct 28, 1969
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C01 - INORGANIC CHEMISTRY
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2789886
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Patent number 2,789,886
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Issue date Apr 23, 1957
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F28 - HEAT EXCHANGE IN GENERAL
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Patent number 2,771,158
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Issue date Nov 20, 1956
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C01 - INORGANIC CHEMISTRY
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2657979
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Patent number 2,657,979
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Issue date Nov 3, 1953
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C01 - INORGANIC CHEMISTRY