Wear protectors; Centralising devices

Introduced: September 1968

Full Title

Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings > Wear protectors; Centralising devices

CPC subdivides this area 10x more granularly than IPC with 9 additional codes.

9 codes are CPC-only extensions.

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E21B 17/1007 CPC only CPC only
E21B 17/1014 +1 CPC CPC only CPC only
E21B 17/1035 CPC only CPC only
E21B 17/1042 +1 CPC CPC only CPC only
E21B 17/1057 +1 CPC CPC only CPC only
E21B 17/1071 CPC only CPC only
E21B 17/1078 CPC only CPC only
E21B 17/1085 CPC only CPC only
E21B 17/1092 CPC only CPC only
E21B 17/12 Devices for placing or drawing out wear protectors IPC+CPC Available in IPC and CPC