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Undulated heat exchanger fin
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Patent number 4,821,795
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Issue date Apr 18, 1989
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McCord Heat Transfer Corporation
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James W. B. Lu
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F28 - HEAT EXCHANGE IN GENERAL
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Air to air heat exchanger
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Patent number 4,483,392
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Issue date Nov 20, 1984
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Xchanger, Inc.
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Edward S. Korsmo
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F28 - HEAT EXCHANGE IN GENERAL
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Plate floor heat exchanger
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Patent number 4,465,128
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Issue date Aug 14, 1984
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Orszagos Koolaj es Gazipari Troszt
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Sandor Krekacs
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F28 - HEAT EXCHANGE IN GENERAL
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3232343
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Patent number 3,232,343
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Issue date Feb 1, 1966
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C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
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2692119
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Patent number 2,692,119
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Issue date Oct 19, 1954
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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2228550
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Patent number 2,228,550
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Issue date Jan 14, 1941
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F28 - HEAT EXCHANGE IN GENERAL
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1618485
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Patent number 1,618,485
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Issue date Feb 22, 1927
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F28 - HEAT EXCHANGE IN GENERAL
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1588348
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Patent number 1,588,348
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Issue date Jun 8, 1926
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F28 - HEAT EXCHANGE IN GENERAL
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1510180
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Patent number 1,510,180
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Issue date Sep 30, 1924
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F28 - HEAT EXCHANGE IN GENERAL
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1422315
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Patent number 1,422,315
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Issue date Jul 11, 1922
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F28 - HEAT EXCHANGE IN GENERAL
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1053309
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Patent number 1,053,309
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Issue date Feb 18, 1913
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F28 - HEAT EXCHANGE IN GENERAL