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Obrin power system
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Patent number 6,800,951
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Issue date Oct 5, 2004
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Obrin Jefferson
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Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC
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Heat transfer element assembly
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Patent number 4,396,058
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Issue date Aug 2, 1983
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The Air Preheater Company
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Hermann E. Kurschner
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Heat regenerator
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Patent number 4,082,138
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Issue date Apr 4, 1978
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U.S. Philips Corporation
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Andries Rinse Miedema
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C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
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3538982
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Patent number 3,538,982
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Issue date Nov 10, 1970
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F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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3216484
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Patent number 3,216,484
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Issue date Nov 9, 1965
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F28 - HEAT EXCHANGE IN GENERAL
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3200877
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Patent number 3,200,877
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Issue date Aug 17, 1965
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F28 - HEAT EXCHANGE IN GENERAL
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2599611
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Patent number 2,599,611
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Issue date Jun 10, 1952
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F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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2492788
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Patent number 2,492,788
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Issue date Dec 27, 1949
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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2464900
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Patent number 2,464,900
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Issue date Mar 22, 1949
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F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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1811455
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Patent number 1,811,455
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Issue date Jun 23, 1931
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F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES
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1654294
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Patent number 1,654,294
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Issue date Dec 27, 1927
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F24 - HEATING RANGES VENTILATING