DIFF Subgroup
F22D 1/08 the tubes having fins, ribs, gills, corrugations, or the like on their outer surfaces, e.g. in vertical arrangement
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Feed-water heaters, e.g. preheaters > with water tubes arranged in the boiler furnaces, fire tubes or flue ways > the tubes having fins, ribs, gills, corrugations, or the like on their outer surfaces, e.g. in vertical arrangement
CPC:
Feed-water heaters, i.e. economisers or like preheaters > with water tubes arranged in the boiler furnaces, fire tubes or flue ways > the tubes having fins, ribs, gills, corrugations, or the like on their outer surfaces, e.g. in vertical arrangement
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
Child Classifications
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