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Regenerative bed heat exchanger
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Patent number 4,909,307
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Issue date Mar 20, 1990
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Canadian Gas Research Institute
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Ferdinand K. Besik
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F24 - HEATING RANGES VENTILATING
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Ventilator unit
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Patent number 4,688,626
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Issue date Aug 25, 1987
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Paul Tengesdal
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F24 - HEATING RANGES VENTILATING
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Regenerative heat exchanger
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Patent number 3,978,912
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Issue date Sep 7, 1976
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Caterpillar Tractor Co.
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Robert Noel Penny
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F28 - HEAT EXCHANGE IN GENERAL
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2891774
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Patent number 2,891,774
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Issue date Jun 23, 1959
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F28 - HEAT EXCHANGE IN GENERAL
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2586207
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Patent number 2,586,207
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Issue date Feb 19, 1952
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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1845239
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Patent number 1,845,239
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Issue date Feb 16, 1932
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F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES
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1739507
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Patent number 1,739,507
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Issue date Dec 17, 1929
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F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES