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Class Information
Number: 122/183
Name: Liquid heaters and vaporizers > Flue > Vertical > Spiral water conduit > Fluid fuel
Description: Devices comprising one or more annular chambers having spiral water passages vertically posited, with or without a fluid fuel burner.

Patents under this class:

Patent Number Title Of Patent Date Issued
4611655 Heat exchanger Sep. 16, 1986
4587949 Combustion heater May. 13, 1986
4584968 Cylindrical boiler Apr. 29, 1986
4480631 Apparatus for delivering heated fluid medium Nov. 6, 1984
4357909 Fluid heater with spiral hot gas flow Nov. 9, 1982
4282833 Hot-water boiler, for instance a central heating boiler, and a metal casting therefor Aug. 11, 1981
4282833 Hot-water boiler, for instance a central heating boiler, and a metal casting therefor Aug. 11, 1981
4278050 Rapid response steam generating apparatus Jul. 14, 1981

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