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3907030
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Patent number 3,907,030
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Issue date Sep 23, 1975
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F28 - HEAT EXCHANGE IN GENERAL
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3734175
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Patent number 3,734,175
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Issue date May 22, 1973
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F28 - HEAT EXCHANGE IN GENERAL
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3244225
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Patent number 3,244,225
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Issue date Apr 5, 1966
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F28 - HEAT EXCHANGE IN GENERAL
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2873098
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Patent number 2,873,098
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Issue date Feb 10, 1959
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F28 - HEAT EXCHANGE IN GENERAL
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2715516
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Patent number 2,715,516
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Issue date Aug 16, 1955
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F28 - HEAT EXCHANGE IN GENERAL
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2498145
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Patent number 2,498,145
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Issue date Feb 21, 1950
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F28 - HEAT EXCHANGE IN GENERAL
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1827480
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Patent number 1,827,480
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Issue date Oct 13, 1931
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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1525094
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Patent number 1,525,094
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Issue date Feb 3, 1925
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F28 - HEAT EXCHANGE IN GENERAL
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1522866
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Patent number 1,522,866
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Issue date Jan 13, 1925
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F28 - HEAT EXCHANGE IN GENERAL
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1442783
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Patent number 1,442,783
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Issue date Jan 16, 1923
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F28 - HEAT EXCHANGE IN GENERAL
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1353449
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Patent number 1,353,449
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Issue date Sep 21, 1920
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F28 - HEAT EXCHANGE IN GENERAL
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1335506
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Patent number 1,335,506
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Issue date Mar 30, 1920
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F28 - HEAT EXCHANGE IN GENERAL
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898363
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Patent number 898,363
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Issue date Sep 8, 1908
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F28 - HEAT EXCHANGE IN GENERAL
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827479
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Patent number 827,479
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Issue date Jul 31, 1906
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F28 - HEAT EXCHANGE IN GENERAL
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596874
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Patent number 596,874
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Issue date Jan 4, 1898
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F28 - HEAT EXCHANGE IN GENERAL