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Heat exchange coil
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Patent number 4,981,171
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Issue date Jan 1, 1991
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Rite Coil, Inc.
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Robert T. Tippmann
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F28 - HEAT EXCHANGE IN GENERAL
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3882932
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Patent number 3,882,932
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Issue date May 13, 1975
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F28 - HEAT EXCHANGE IN GENERAL
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3601184
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Patent number 3,601,184
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Issue date Aug 24, 1971
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F24 - HEATING RANGES VENTILATING
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3173479
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Patent number 3,173,479
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Issue date Mar 16, 1965
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F28 - HEAT EXCHANGE IN GENERAL
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2526243
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Patent number 2,526,243
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Issue date Oct 17, 1950
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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1922815
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Patent number 1,922,815
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Issue date Aug 15, 1933
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F28 - HEAT EXCHANGE IN GENERAL
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1849396
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Patent number 1,849,396
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Issue date Mar 15, 1932
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F28 - HEAT EXCHANGE IN GENERAL
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1637276
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Patent number 1,637,276
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Issue date Jul 26, 1927
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F28 - HEAT EXCHANGE IN GENERAL
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1476789
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Patent number 1,476,789
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Issue date Dec 11, 1923
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C21 - METALLURGY OF IRON
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1189470
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Patent number 1,189,470
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Issue date Jul 4, 1916
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F24 - HEATING RANGES VENTILATING
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47991
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Patent number 47,991
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Issue date May 30, 1865
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H01 - BASIC ELECTRIC ELEMENTS