Fishing for or freeing objects in boreholes or wells

Introduced: September 1968

Of 9 combined children, 5 exist in both systems.

4 codes are CPC-only extensions.

Child Classifications

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E21B 31/002 CPC only CPC only
E21B 31/005 CPC only CPC only
E21B 31/007 CPC only CPC only
E21B 31/03 Freeing by flushing since 1980 IPC+CPC Available in IPC and CPC
E21B 31/035 CPC only CPC only
E21B 31/06 using magnetic means IPC+CPC Available in IPC and CPC
E21B 31/08 using junk baskets or the like IPC+CPC Available in IPC and CPC
E21B 31/107 using impact means for releasing stuck parts, e.g. jars since 1980 +1 CPC IPC+CPC Available in IPC and CPC
E21B 31/12 Grappling tools, e.g. tongs or grabs +1 CPC IPC+CPC Available in IPC and CPC