F28F 21/081 — IPC vs CPC Diff | Patent Classification Explorer

DIFF Subgroup

F28F 21/081

Full Title

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

Of 5 combined children, 0 exist in both systems.

5 codes are CPC-only extensions.

This code exists only in CPC.

Diff view requires codes present in both systems.