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Double-spiral heat exchanger
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Patent number 4,785,878
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Issue date Nov 22, 1988
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Outokumpu Oy
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Markku V. Honkajarvi
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F28 - HEAT EXCHANGE IN GENERAL
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3739842
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Patent number 3,739,842
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Issue date Jun 19, 1973
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F28 - HEAT EXCHANGE IN GENERAL
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3118498
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Patent number 3,118,498
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Issue date Jan 21, 1964
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F28 - HEAT EXCHANGE IN GENERAL
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2778609
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Patent number 2,778,609
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Issue date Jan 22, 1957
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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2650802
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Patent number 2,650,802
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Issue date Sep 1, 1953
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F28 - HEAT EXCHANGE IN GENERAL
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2611585
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Patent number 2,611,585
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Issue date Sep 23, 1952
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F28 - HEAT EXCHANGE IN GENERAL
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2539886
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Patent number 2,539,886
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Issue date Jan 30, 1951
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F28 - HEAT EXCHANGE IN GENERAL
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2286271
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Patent number 2,286,271
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Issue date Jun 16, 1942
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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1944148
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Patent number 1,944,148
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Issue date Jan 23, 1934
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A23 - FOODS OR FOODSTUFFS THEIR TREATMENT, NOT COVERED BY OTHER CLASSES
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1886498
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Patent number 1,886,498
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Issue date Nov 8, 1932
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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1840613
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Patent number 1,840,613
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Issue date Jan 12, 1932
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F28 - HEAT EXCHANGE IN GENERAL
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1796707
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Patent number 1,796,707
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Issue date Mar 17, 1931
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F28 - HEAT EXCHANGE IN GENERAL