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3848289
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Patent number 3,848,289
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Issue date Nov 19, 1974
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F28 - HEAT EXCHANGE IN GENERAL
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3457580
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Patent number 3,457,580
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Issue date Jul 29, 1969
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F28 - HEAT EXCHANGE IN GENERAL
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2863304
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Patent number 2,863,304
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Issue date Dec 9, 1958
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F28 - HEAT EXCHANGE IN GENERAL
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2599077
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Patent number 2,599,077
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Issue date Jun 3, 1952
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F28 - HEAT EXCHANGE IN GENERAL
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2397156
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Patent number 2,397,156
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Issue date Mar 26, 1946
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F28 - HEAT EXCHANGE IN GENERAL
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2117175
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Patent number 2,117,175
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Issue date May 10, 1938
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F28 - HEAT EXCHANGE IN GENERAL
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1875407
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Patent number 1,875,407
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Issue date Sep 6, 1932
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F28 - HEAT EXCHANGE IN GENERAL
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1626491
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Patent number 1,626,491
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Issue date Apr 26, 1927
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F28 - HEAT EXCHANGE IN GENERAL
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1569203
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Patent number 1,569,203
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Issue date Jan 12, 1926
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B08 - CLEANING
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1355726
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Patent number 1,355,726
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Issue date Oct 12, 1920
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F28 - HEAT EXCHANGE IN GENERAL