Underwater drilling (using heave compensators E21B19/09)

Introduced: September 1968

Title

Titles differ between systems:

IPC: Underwater drilling

CPC: Underwater drilling (using heave compensators E21B19/09)

Full titles differ between systems:

IPC:

Special methods or apparatus for drilling > Underwater drilling

CPC:

Special methods or apparatus for drilling > Underwater drilling (using heave compensators E21B19/09)

Underwater drilling using heave compensators

Of 5 combined children, 4 exist in both systems.

1 codes are CPC-only extensions.

1 shared codes have differing titles between IPC and CPC.

IPC defines codes here since 1980.

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E21B 7/122 CPC only CPC only
E21B 7/124 with underwater tool drive prime mover, e.g. portable drilling rigs for use on underwater floors since 1980 +1 CPC IPC+CPC Available in IPC and CPC
E21B 7/128 from floating support with independent underwater anchored guide base since 1980 IPC+CPC Available in IPC and CPC
E21B 7/132 from underwater buoyant support since 1980 IPC+CPC Available in IPC and CPC
E21B 7/136 from non-buoyant support (E21B7/124 takes precedence) since 1980 IPC+CPC Available in IPC and CPC

Class E21,2013–2023, worldwide · Source: EPO PATSTAT

Class E21,2013–2023, worldwide · Source: EPO PATSTAT