Constructions of heat-exchange apparatus characterised by the selection of particular materials

Introduced: September 1968

Of 6 combined children, 4 exist in both systems.

2 codes are CPC-only extensions.

Child Classifications

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F28F 21/003 CPC only CPC only
F28F 21/006 CPC only CPC only
F28F 21/02 of carbon, e.g. graphite IPC+CPC Available in IPC and CPC
F28F 21/04 of ceramic; of concrete; of natural stone +1 CPC IPC+CPC Available in IPC and CPC
F28F 21/06 of plastics material +4 CPC IPC+CPC Available in IPC and CPC
F28F 21/08 of metal +3 CPC IPC+CPC Available in IPC and CPC