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PCE
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DIFF Subgroup
E21B 37/08

cleaning in situ of down-hole filters, screens, or gravel packs (E21B37/06 takes precedence)

Introduced: January 1980

Title

Titles differ between systems:

IPC: cleaning of down-hole filters, screens, or gravel packs

CPC: cleaning in situ of down-hole filters, screens, or gravel packs (E21B37/06 takes precedence)

Full Title

Full titles differ between systems:

IPC:

Methods or apparatus for cleaning boreholes or wells > cleaning of down-hole filters, screens, or gravel packs

CPC:

Methods or apparatus for cleaning boreholes or wells (E21B21/00 takes precedence) > cleaning in situ of down-hole filters, screens, or gravel packs (E21B37/06 takes precedence)

No child classifications to compare. This is a leaf node in both IPC and CPC.