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2956784
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Patent number 2,956,784
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Issue date Oct 18, 1960
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F28 - HEAT EXCHANGE IN GENERAL
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1845540
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Patent number 1,845,540
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Issue date Feb 16, 1932
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F28 - HEAT EXCHANGE IN GENERAL
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1786163
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Patent number 1,786,163
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Issue date Dec 23, 1930
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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1770718
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Patent number 1,770,718
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Issue date Jul 15, 1930
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F28 - HEAT EXCHANGE IN GENERAL
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1546124
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Patent number 1,546,124
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Issue date Jul 14, 1925
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
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1502258
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Patent number 1,502,258
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Issue date Jul 22, 1924
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F28 - HEAT EXCHANGE IN GENERAL
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1459433
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Patent number 1,459,433
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Issue date Jun 19, 1923
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
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1013178
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Patent number 1,013,178
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Issue date Jan 2, 1912
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F28 - HEAT EXCHANGE IN GENERAL
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971505
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Patent number 971,505
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Issue date Sep 27, 1910
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F28 - HEAT EXCHANGE IN GENERAL
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806132
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Patent number 806,132
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Issue date Dec 5, 1905
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F28 - HEAT EXCHANGE IN GENERAL
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804912
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Patent number 804,912
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Issue date Nov 21, 1905
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F28 - HEAT EXCHANGE IN GENERAL
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777138
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Patent number 777,138
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Issue date Dec 13, 1904
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F28 - HEAT EXCHANGE IN GENERAL
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764541
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Patent number 764,541
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Issue date Jul 12, 1904
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F28 - HEAT EXCHANGE IN GENERAL
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725212
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Patent number 725,212
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Issue date Apr 14, 1903
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F28 - HEAT EXCHANGE IN GENERAL
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724971
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Patent number 724,971
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Issue date Apr 7, 1903
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F28 - HEAT EXCHANGE IN GENERAL
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549001
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Patent number 549,001
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Issue date Oct 29, 1895
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F28 - HEAT EXCHANGE IN GENERAL
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510107
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Patent number 510,107
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Issue date Dec 5, 1893
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F28 - HEAT EXCHANGE IN GENERAL
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412271
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Patent number 412,271
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Issue date Oct 8, 1889
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F28 - HEAT EXCHANGE IN GENERAL
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281927
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Patent number 281,927
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Issue date Jul 24, 1883
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F28 - HEAT EXCHANGE IN GENERAL
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60222
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Patent number 60,222
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Issue date Dec 4, 1866
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F28 - HEAT EXCHANGE IN GENERAL