Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers (percussion drill bits with leading portion E21B10/40)

Introduced: January 1980

Title

Titles differ between systems:

IPC: Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers

CPC: Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers (percussion drill bits with leading portion E21B10/40)

Full Title

Full titles differ between systems:

IPC:

Drill bits > Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers

CPC:

Drill bits (specially adapted for deflecting the direction of boring ; with means for collecting substances E21B27/00) > Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers (percussion drill bits with leading portion E21B10/40)

Of 3 combined children, 2 exist in both systems.

1 codes are CPC-only extensions.

IPC defines codes here since 1980.

Child Classifications

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E21B 10/265 CPC only CPC only
E21B 10/28 with non-expansible roller cutters since 1980 IPC+CPC Available in IPC and CPC
E21B 10/32 with expansible cutting tools since 1980 +3 CPC IPC+CPC Available in IPC and CPC