E21B 33/1208 — IPC vs CPC Diff | Patent Classification Explorer

DIFF Subgroup

E21B 33/1208

Full Title

Sealing or packing boreholes or wells > in the borehole > Packers; Plugs (used for cementing E21B33/134, E21B33/16)

Of 2 combined children, 0 exist in both systems.

2 codes are CPC-only extensions.

This code exists only in CPC.

Diff view requires codes present in both systems.