F28D 21/0001 — IPC vs CPC Diff | Patent Classification Explorer

DIFF Subgroup

F28D 21/0001

Full Title

Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00

Of 3 combined children, 0 exist in both systems.

3 codes are CPC-only extensions.

This code exists only in CPC.

Diff view requires codes present in both systems.