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PCE
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DIFF Subgroup
E21B 33/14

for cementing casings into boreholes

Introduced: September 1968

Full Title

Sealing or packing boreholes or wells > in the borehole > Methods or devices for cementing, for plugging holes, crevices or the like > for cementing casings into boreholes

CPC subdivides this area 3x more granularly than IPC with 2 additional codes.

2 codes are CPC-only extensions.

Child Classifications

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  • E21B 33/143 CPC only CPC only
  • E21B 33/146 CPC only CPC only