DIFF Subgroup
E21B 33/126 with fluid-pressure-operated elastic cup or skirt (E21B33/122, E21B33/124 take precedence)
Introduced: September 1968
Title
Titles differ between systems:
IPC: with fluid-pressure-operated elastic cup or skirt
CPC: with fluid-pressure-operated elastic cup or skirt (E21B33/122, E21B33/124 take precedence)
Full Title
Full titles differ between systems:
IPC:
Sealing or packing boreholes or wells > in the borehole > Packers; Plugs > with fluid-pressure-operated elastic cup or skirt
CPC:
Sealing or packing boreholes or wells > in the borehole > Packers; Plugs (used for cementing E21B33/134, E21B33/16) > with fluid-pressure-operated elastic cup or skirt (E21B33/122, E21B33/124 take precedence)
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.
Child Classifications
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