H04R 1/2807 — IPC vs CPC Diff | Patent Classification Explorer

DIFF Subgroup

H04R 1/2807

Full Title

Details of transducers, > Arrangements for obtaining desired frequency or directional characteristics (for stereophonic purpose H04R5/00) > for obtaining desired frequency characteristic only > Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means

Of 6 combined children, 0 exist in both systems.

6 codes are CPC-only extensions.

This code exists only in CPC.

Diff view requires codes present in both systems.

View in CPC →