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3863711
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Patent number 3,863,711
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Issue date Feb 4, 1975
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F28 - HEAT EXCHANGE IN GENERAL
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3147800
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Patent number 3,147,800
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Issue date Sep 8, 1964
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3117623
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Patent number 3,117,623
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Issue date Jan 14, 1964
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F28 - HEAT EXCHANGE IN GENERAL
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2715019
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Patent number 2,715,019
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Issue date Aug 9, 1955
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F22 - STEAM GENERATION
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1951752
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Patent number 1,951,752
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Issue date Mar 20, 1934
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F22 - STEAM GENERATION
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1942878
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Patent number 1,942,878
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Issue date Jan 9, 1934
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F28 - HEAT EXCHANGE IN GENERAL
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1809896
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Patent number 1,809,896
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Issue date Jun 16, 1931
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F28 - HEAT EXCHANGE IN GENERAL
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1804939
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Patent number 1,804,939
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Issue date May 12, 1931
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F22 - STEAM GENERATION
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1668965
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Patent number 1,668,965
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Issue date May 8, 1928
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F22 - STEAM GENERATION
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1652067
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Patent number 1,652,067
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F28 - HEAT EXCHANGE IN GENERAL
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Patent number 964,941
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Issue date Jul 19, 1910
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F28 - HEAT EXCHANGE IN GENERAL
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955127
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Patent number 955,127
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F28 - HEAT EXCHANGE IN GENERAL
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F28 - HEAT EXCHANGE IN GENERAL
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398645
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Patent number 398,645
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Issue date Feb 26, 1889
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F28 - HEAT EXCHANGE IN GENERAL
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389900
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Patent number 389,900
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F28 - HEAT EXCHANGE IN GENERAL
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347228
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Patent number 347,228
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F28 - HEAT EXCHANGE IN GENERAL
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175241
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Patent number 175,241
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F28 - HEAT EXCHANGE IN GENERAL