DIFF Subgroup
F01K 3/20 with heating by combustion gases of main boiler
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein > having heaters > with heating by combustion gases of main boiler
CPC:
Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein (regenerating exhaust steam F01K19/00) > having heaters (having both steam accumulator and heater F01K3/14; steam heaters per se F22) > with heating by combustion gases of main boiler
Of 2 combined children, 1 exist in both systems.
1 codes are CPC-only extensions.
1 shared codes have differing titles between IPC and CPC.
Child Classifications
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- F01K 3/22 Controlling, e.g. starting, stopping (F01K7/00, F01K13/02 take precedence) IPC+CPC Available in IPC and CPC