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Heat exchanger
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Patent number 4,556,104
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Issue date Dec 3, 1985
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Engelhardt; Rolf Dieter
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Rolf D. Engelhardt
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F24 - HEATING RANGES VENTILATING
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2752127
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Patent number 2,752,127
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Issue date Jun 26, 1956
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F28 - HEAT EXCHANGE IN GENERAL
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2537678
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Patent number 2,537,678
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Issue date Jan 9, 1951
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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2532995
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Patent number 2,532,995
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Issue date Dec 5, 1950
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2021117
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Patent number 2,021,117
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Issue date Nov 12, 1935
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F28 - HEAT EXCHANGE IN GENERAL
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1953302
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Patent number 1,953,302
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Issue date Apr 3, 1934
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F28 - HEAT EXCHANGE IN GENERAL
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1924900
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Patent number 1,924,900
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Issue date Aug 29, 1933
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F28 - HEAT EXCHANGE IN GENERAL
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1783355
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Patent number 1,783,355
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Issue date Dec 2, 1930
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F28 - HEAT EXCHANGE IN GENERAL
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1782205
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Patent number 1,782,205
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Issue date Nov 18, 1930
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F22 - STEAM GENERATION
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1770375
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Patent number 1,770,375
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Issue date Jul 15, 1930
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F28 - HEAT EXCHANGE IN GENERAL
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1715919
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Patent number 1,715,919
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Issue date Jun 4, 1929
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F22 - STEAM GENERATION
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1382670
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Patent number 1,382,670
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Issue date Jun 28, 1921
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F28 - HEAT EXCHANGE IN GENERAL
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1372901
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Patent number 1,372,901
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Issue date Mar 29, 1921
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F28 - HEAT EXCHANGE IN GENERAL
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1222801
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Patent number 1,222,801
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Issue date Apr 17, 1917
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F28 - HEAT EXCHANGE IN GENERAL
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1073302
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Patent number 1,073,302
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Issue date Sep 16, 1913
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F28 - HEAT EXCHANGE IN GENERAL
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706636
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Patent number 706,636
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Issue date Aug 12, 1902
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F28 - HEAT EXCHANGE IN GENERAL
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521838
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Patent number 521,838
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Issue date Jun 26, 1894
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F28 - HEAT EXCHANGE IN GENERAL
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285472
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Patent number 285,472
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Issue date Sep 25, 1883
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F28 - HEAT EXCHANGE IN GENERAL
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208915
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Patent number 208,915
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Issue date Oct 15, 1878
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F28 - HEAT EXCHANGE IN GENERAL
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145591
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Patent number 145,591
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Issue date Dec 16, 1873
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F28 - HEAT EXCHANGE IN GENERAL
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124803
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Patent number 124,803
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Issue date Mar 19, 1872
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F28 - HEAT EXCHANGE IN GENERAL
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75044
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Patent number 75,044
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Issue date Mar 3, 1868
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F28 - HEAT EXCHANGE IN GENERAL