Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for

Introduced: September 1968

Of 5 combined children, 4 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 25/005 CPC only CPC only
F01K 25/02 the fluid remaining in the liquid phase IPC+CPC Available in IPC and CPC
F01K 25/04 the fluid being in different phases, e.g. foamed IPC+CPC Available in IPC and CPC
F01K 25/06 using mixtures of different fluids (plants using mixtures of steam and gas F01K21/04) +1 CPC IPC+CPC Available in IPC and CPC
F01K 25/08 using special vapours +1 CPC IPC+CPC Available in IPC and CPC