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Heat exchanger
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Patent number 4,423,771
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Issue date Jan 3, 1984
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Charles V. Frederick
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F28 - HEAT EXCHANGE IN GENERAL
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3470949
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Patent number 3,470,949
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Issue date Oct 7, 1969
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F28 - HEAT EXCHANGE IN GENERAL
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3250323
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Patent number 3,250,323
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Issue date May 10, 1966
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F28 - HEAT EXCHANGE IN GENERAL
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2028455
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Patent number 2,028,455
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Issue date Jan 21, 1936
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F28 - HEAT EXCHANGE IN GENERAL
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1940804
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Patent number 1,940,804
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Issue date Dec 26, 1933
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F28 - HEAT EXCHANGE IN GENERAL
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1870012
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Patent number 1,870,012
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Issue date Aug 2, 1932
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F28 - HEAT EXCHANGE IN GENERAL
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1810215
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Patent number 1,810,215
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Issue date Jun 16, 1931
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F28 - HEAT EXCHANGE IN GENERAL
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1761395
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Patent number 1,761,395
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Issue date Jun 3, 1930
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F28 - HEAT EXCHANGE IN GENERAL
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1527736
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Patent number 1,527,736
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Issue date Feb 24, 1925
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F28 - HEAT EXCHANGE IN GENERAL