DIFF Subgroup
E21B 21/01 Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes
Introduced: January 2000
Full Title
Full titles differ between systems:
IPC:
Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor > Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes
CPC:
Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor (freeing objects stuck in boreholes by flushing E21B31/03) > Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes
CPC subdivides this area 3x more granularly than IPC with 2 additional codes.
2 codes are CPC-only extensions.
IPC defines codes here since 2000.
Child Classifications
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- E21B 21/015 Means engaging the bore entrance, e.g. hoods for collecting dust since 2000 IPC+CPC Available in IPC and CPC