H04M 2017/25 — IPC vs CPC Diff | Patent Classification Explorer

DIFF Subgroup Additional Only

H04M 2017/25

Full Title

Prepayment telephone systems (using a coded card to authorise calls from a telephone set H04M1/675)

Of 4 combined children, 0 exist in both systems.

4 codes are CPC-only extensions.

Note: 4 CPC extensions are marked as secondary classification only.

This code exists only in CPC.

Diff view requires codes present in both systems.