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Instantaneous water heater
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Patent number 6,192,192
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Issue date Feb 20, 2001
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Creaholic SA
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Francesco Illy
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F24 - HEATING RANGES VENTILATING
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Reverse flow heat exchangers
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Patent number 4,143,702
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Issue date Mar 13, 1979
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Sterling Drug, Inc.
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James W. Barr
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F28 - HEAT EXCHANGE IN GENERAL
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3457108
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Patent number 3,457,108
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Issue date Jul 22, 1969
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F28 - HEAT EXCHANGE IN GENERAL
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3397110
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Patent number 3,397,110
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Issue date Aug 13, 1968
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F28 - HEAT EXCHANGE IN GENERAL
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2921774
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Patent number 2,921,774
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Issue date Jan 19, 1960
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F28 - HEAT EXCHANGE IN GENERAL
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2600820
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Patent number 2,600,820
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Issue date Jun 17, 1952
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F28 - HEAT EXCHANGE IN GENERAL
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2392255
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Patent number 2,392,255
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Issue date Jan 1, 1946
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F28 - HEAT EXCHANGE IN GENERAL
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1951420
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Patent number 1,951,420
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Issue date Mar 20, 1934
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F28 - HEAT EXCHANGE IN GENERAL
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1909556
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Patent number 1,909,556
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Issue date May 16, 1933
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F28 - HEAT EXCHANGE IN GENERAL
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1884555
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Patent number 1,884,555
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Issue date Oct 25, 1932
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F28 - HEAT EXCHANGE IN GENERAL
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1840834
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Patent number 1,840,834
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Issue date Jan 12, 1932
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F28 - HEAT EXCHANGE IN GENERAL