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3599709
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F26 - DRYING
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3208512
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F27 - FURNACES KILNS OVENS RETORTS
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2919116
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Patent number 2,919,116
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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2919114
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Patent number 2,919,114
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F28 - HEAT EXCHANGE IN GENERAL
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2884229
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Patent number 2,884,229
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F28 - HEAT EXCHANGE IN GENERAL
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F28 - HEAT EXCHANGE IN GENERAL
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1600197
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1556230
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A23 - FOODS OR FOODSTUFFS THEIR TREATMENT, NOT COVERED BY OTHER CLASSES
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Patent number 1,090,549
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F28 - HEAT EXCHANGE IN GENERAL
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1016019
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F28 - HEAT EXCHANGE IN GENERAL
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1005396
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Patent number 1,005,396
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F28 - HEAT EXCHANGE IN GENERAL
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931695
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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889009
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Patent number 889,009
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F28 - HEAT EXCHANGE IN GENERAL
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875874
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F28 - HEAT EXCHANGE IN GENERAL
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848362
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F28 - HEAT EXCHANGE IN GENERAL
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F28 - HEAT EXCHANGE IN GENERAL
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F28 - HEAT EXCHANGE IN GENERAL
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813358
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F28 - HEAT EXCHANGE IN GENERAL
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766868
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F28 - HEAT EXCHANGE IN GENERAL
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738106
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Patent number 738,106
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F28 - HEAT EXCHANGE IN GENERAL
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677870
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F28 - HEAT EXCHANGE IN GENERAL
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664187
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F28 - HEAT EXCHANGE IN GENERAL
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659299
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F28 - HEAT EXCHANGE IN GENERAL
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622431
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F28 - HEAT EXCHANGE IN GENERAL
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621074
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F28 - HEAT EXCHANGE IN GENERAL
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496217
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F28 - HEAT EXCHANGE IN GENERAL
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491338
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F28 - HEAT EXCHANGE IN GENERAL
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461933
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F28 - HEAT EXCHANGE IN GENERAL
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323251
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316007
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F28 - HEAT EXCHANGE IN GENERAL